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人教版高中历史必修3从蒸汽机到互联网教案

  • 新人教版高中英语必修1Unit 1 Teenage Life-Reading for Writing教案

    新人教版高中英语必修1Unit 1 Teenage Life-Reading for Writing教案

    【教材分析】This teaching period mainly deals with reading for writing a letter of advice. Students are expected to learn the knowledge about how to write a suggestion letter. The teacher is expected to enable students to master some writing skills concerning suggestion letters and learn to write one.【教学目标与核心素养】1. Get students to have a good understanding of how to write a suggestion letter properly.2. Enable students to use some writing skills flexibly.3. Develop students’ writing and cooperating abilities.4. Strengthen students’ great interest in writing discourses.【教学重难点】1. How to enable students to have a good understanding of the skills of writing a suggestion letter2.How to enable students to write a good recommendation letter using some writing skills properly.【教学过程】Step 1: Lead in Begin the class with the lead-in questions: how to write a letter for advice? What kinds of aspects should be included? It is strongly recommended that the teacher should ask students to discuss the topic freely with their partners and brainstorm some ideas concerning the topic. In this way, students can come up with more ideas and avoid being nervous at the beginning of the class.Step 2: Read to discover details concerning advice letters’ writing style.The teacher is expected to ask students to read a letter offering some advice on page 18 silently and then request students to discuss the questions below.

  • 新人教版高中英语必修1Unit 2 Travelling Around-Discovering Useful Structure教案

    新人教版高中英语必修1Unit 2 Travelling Around-Discovering Useful Structure教案

    (5)be to do (可以和具体的时间状语连用)①表示按计划、安排即将发生的动作。②用于时间、条件状语从句中,表示“如果要……,想要……”。The students are to meet at the school gate tomorrow. 明天学生们将在学校大门口集会。 If you are to succeed, you must work as hard as possible. 如果你想要成功,比必须努力工作。(6)be about to do (不与具体的时间状语连用) 表示即将要发生的动作。We are about to start. 我们就要出发了。The new school year is about to begin. 新学年开学在即。(7)一般现在时表将来①表示按时间表规定将要发生的动作。常限于表示位置移动的短暂性动词。②在时间、条件或让步状语从句中,用一般现在时表将来。Look at the timetable. Hurry up! Flight 4026 takes off at 18:20. 你看看时刻表,快点!4026次航班的起飞时间是下午6点20分。Jane is in a hurry because the train to the airport leaves in half an hour. 简很匆忙,因为去机场的火车半小时后出发。

  • 新人教版高中英语必修1Unit 4 Natural Disasters-Discovering Useful Structures教案

    新人教版高中英语必修1Unit 4 Natural Disasters-Discovering Useful Structures教案

    【教材分析】This teaching period mainly deals with the grammar: the restrictive relative clauses.This period carries considerable significance to the cultivation of students’ writing competence and lays a solid foundation for the basic appreciation of language beauty. The teacher is expected to enable students to master this period thoroughly and consolidate the knowledge by doing some exercise of good quality.【教学目标与核心素养】1. Get students to have a good understanding of the basic usages of the restrictive relative clauses.2. Enable students to use the restrictive relative clauses flexibly.3. Develop students’ speaking and cooperating abilities.4. Strengthen students’ great interest in grammar learning.【教学重难点】How to enable students to have a good understanding of the restrictive relative clauses, especially the uses of the relative words such as which, that, who, whom.【教学过程】Step1: 语法知识呈现定语从句(一)—关系代词的用法在复合句中, 修饰名词或代词的从句叫定语从句。定语从句通常由关系代词或关系副词引导,说明事物的具体信息,从句位于被修饰词之后。被定语从句修饰的词叫先行词,引导定语从句的词叫关系词,关系词指代先行词,并在定语从句中充当成分。关系词有两种:关系代词who, whom ,whose, that, which, as和关系副词when, where, why。

  • 新人教版高中英语必修1Welcome Unit-Discovering Useful Structures教案

    新人教版高中英语必修1Welcome Unit-Discovering Useful Structures教案

    II Learn the technical terms-2.1. What can be used as “Subject, Object, Predicative, Direct Object, Indirect Object and objective complement” in a sentence?2. What can be used as “adverbial” in a sentence?3. What can be used as “verb” in a sentence?Answers to questions 1-3:1. Nouns, pronouns and appellations can be used as “Subject, Object, Predicative, Direct Object, Indirect Object and Objective Complement”. Besides, adjectives can be used as “Predicative and Objective Complement” in a sentence.2. Adverbs and prepositional phrases can be used as “Adverbial”.3. Verbs with actual meaning can be used as “Verb” in a sentence. Auxiliary verbs alone cannot be used as “Verb” in a sentence.III Learn to recognize the sentence structures.1. SV structure. For Example:(1) A bird flies.S V(2) A monkey jumps.S V(3) A fish swims.S V√ In SV structures, verbs are “intransitive verbs”.2. SVO structure. For Example:(1) A sheep eats grass.S V O(2) They like bananas.S V O(3) He wants candy.S V O√ In SVO structures, verbs are “transitive verbs”.3. SP structure. For Example:(1) This is great.S P (2) He looks well.S P (3) She became a teacher.S P √ In SP structures, Predicatives are formed by “link verbs” and “adjectives or nouns”.√ link verbs: be, become, grow, look, feel, taste, etc.4. SV IO DO structure. For Example:(1) He asked me a question.S V IO DO(2) Danny wrote me a letter.S V IO DO(3) Billy brought Sam a kite.S V IO DO√ In SV IO DO structures, the verbs are transitive and are followed by two objectives – pronouns or nouns as Indirect Objective, and nouns as Direct Objectives.

  • 新人教版高中英语必修1Unit 5 Languages Around the World-Reading and Thinking教案

    新人教版高中英语必修1Unit 5 Languages Around the World-Reading and Thinking教案

    【教材分析】本节课是高中英语第一册的最后一个单元的阅读和思考部分,文章难度明显增加,体现在以下几个方面:文章题材是说明文,比较难理解;话题生疏,涉及到历史等知识;生词量增大,而且在语境中理解词汇的要求提高。面对这些,教师的难度和高度也要有所提升,通过探讨说明顺序,了解背景知识等帮助他们找到说明文阅读的方法。【教学目标与核心素养】1. 文化意识目标新课程中指出,文化意识是对中外文化的理解和对优秀文化的认同。文化意识的的培养有助于学生增加国家认同和家国情怀,成为有文明素养和社会责任感的人。我们这个单元很好体现了这一点,通过了解汉字书写的体系和发展,学生可以有一种文化自豪感,同时也能够帮助学生深入挖掘这篇文章,从而想到更多和中国文化相关的方面。2. 学习能力目标

  • 新人教版高中英语必修1Welcome Unit-Reading for Writing教案

    新人教版高中英语必修1Welcome Unit-Reading for Writing教案

    教学目标知识目标:让学生更好理解如何恰当地写一个人的信息介绍,并能让学生熟练地使用一些写作技能。能力目标:培养学生的写作能力和团队协作能力。情感目标:提升学生对写作的兴趣。教学重难点 教学重点:如何能让学生更好地理解个人信息介绍。教学难点:如何能让学生通过适当地使用一些写作技能来写一篇较好的个人信息介绍。教学准备 多媒体、黑板、粉笔一、Pre-class1. Greetings2. Leading-inAsk students how to write a profile. What kinds of aspects should be included? The teacher asks students to discuss the topic with each other and put forward to much more ideas about the answer.二、While-class1. The teacher lets students to read the student profiles on Page 8 silently and then asks students to discuss the questions below.1. What is Ann like? How do you know?2. What are Thando’s hobbies?3. Where does Thando come from?4. What is Thando’s dream?5. What does “You will never see me without a book or a pen” mean?

  • 新人教版高中英语必修2Unit 1 Cultural Heritage-Discovering Useful Structure教案二

    新人教版高中英语必修2Unit 1 Cultural Heritage-Discovering Useful Structure教案二

    This theme of the part is “ Describe people or things in greater detail”. Students have learned the grammar(restrictive relative clauses) in Book 1, and further review and consolidate its structure “prep+relative pronouns(which/whom)” and the relative adverbs(when, where and why), besides students should understand its form, meaning and functions. In this section, students should be able to express the grammar correctly in daily communication and in the writing. 1. Review the basic usages of relative pronouns and adverbs of attributive clauses . 2. Learn to use some special cases about restrictive relative clauses.3. Learn to write sentences with restrictive relative clauses flexibly according to the context.1. Review the basic usages of relative pronouns and adverbs of attributive clauses .2. Learn to use some special cases about restrictive relative clauses.3. Learn tow rite sentences with restrictive relative clauses flexibly according to the context.Step 1. Observe the following sentences, and mark the relative pronouns and the adverbs. 1. After listening to the scientists who had studied the problems, and citizens who lived near the dam, the government turned to the United Nations for help.2. Temples and other cultural sites were taken down piece by piece, and then moved and put back together again in a place where they were safe from the water.Step 2 PracticePlease complete these sentences with relative pronouns and relative adverbs and answer the following questions.Questions: 1. What is the head noun ?2. What relative words should be used ?3. What elements do they act in these sentences ?

  • 新人教版高中英语必修2Unit 2 Wildlife Protection-Reading for Writing教案二

    新人教版高中英语必修2Unit 2 Wildlife Protection-Reading for Writing教案二

    This lesson aims at making a poster about protecting wildlife after reading some posters. During reading students are guided to understand the content and try to summarize the posters with one sentence. Then students are guided to try to make a poster about protecting wildlife.1. Read the two posters and try to understand the summary sentences.2. Look at the two posters and try to understand what emotions they express.3. Try to summarize the features of posters4. Try to make a poster about wildlife.1. Look at the two posters and try to understand what emotions they express.2. Try to summarize the features of posters3. Try to make a poster about wildlife.Step 1 Lead inLook at the the posters on the textbook and ask:Which emotions do the posters communicate ?Step 2 Read the poster and answer the questions.1. What do you think of the animals in the poster on the left ?I think it is frightening and ugly.2. Why do we should protect the ugly animals ?All species--the good, the bad, and the ugly-- should be treated equally.The world needs all kinds--without variety, our planet cannot survive.3. Why are billions of trees being cut down every year ?To make paper for humans.4. What result will be lead to after the trees are cut down ?A lost of animal homes are being destroyed./The habitat of wildlife is being destroyed.Step 3 Find the feature of posters1. What does each poster use to stir up emotions ?On the left, it makes us a little frightened and it looks a little ugly, but it can activate our curiosity--What is it? And What is wrong with it?On the right, it makes us feel a little sad and want to protect them.

  • 新人教版高中英语必修2Unit 2 Wildlife Protection-Discovering Useful Structure教案二

    新人教版高中英语必修2Unit 2 Wildlife Protection-Discovering Useful Structure教案二

    2.表示现阶段正在进行的被动动作(该动作在说话的瞬间未必正在进行)。Many interesting experiments are being carried out these days.(说话时,并不一定正在进行)3.表示一种经常性的被动行为,常和always,constantly 等表示频度的副词连用,这种用法常常带有赞扬或厌恶的感情色彩。He is always being praised by the leader.4.表示按计划或安排主语将要承受谓语动词所表示的动作(仅限于少数及物动词)。A party is being held tonight.Step 4 Special cases1.像take care of, look after, talk about, think of等动词与介词构成的短语用于现在进行时的被动语态时, 其中的介词不可省略。The ways to stop illegally hunting are being talked about. 2.可与部分情态动词连用,表示对正在发生的事情的推测。She may be being punished by her mother.3.有时可表示按计划或安排将要进行的一个被动动作。A celebration is being held this weekend for his success.4.某些表示“状态、心理活动、存在”等的动词,如have,want,need,love,一般不用现在进行时的被动语态,而常用一般现在时的被动语态。With the population increasing,more land is needed.5.“be+under/in+n.”可表示现在进行时的被动意义。My computer is under repair.=My computer is being repaired.

  • 新人教版高中英语必修2Unit 2 Wildlife Protection-Discovering Useful Structure教案一

    新人教版高中英语必修2Unit 2 Wildlife Protection-Discovering Useful Structure教案一

    The activity topic of this section is "report an ongoing event", and the structure is the passive voice of present continuous tense. Rare wild animals are suffering from large-scale poaching, and species are on the brink of danger. Rescue operations are underway. "Being" and "suffering" are the meanings of the present progressive passive voice.The usage of present progressive passive voice is of great importance in writing a good discourse and appreciating some difficult language items, so it is vital to master it and use it flexibly in a context.1. Motivate Ss to deepen the understanding of the usage of present progressive passive voice in a fixed context.2. Enable Ss to master the usage of present progressive passive voice and use it flexibly in a context.3. Lead Ss to construct sentences or appreciate sentences used master it and use it flexibly in a context.1. Help students to appreciate the function of the usage of present progressive passive voice in a sentence2. Instruct students to write essays using the proper usage of present progressive passive voice.Look at the picture and tell me what are workers doing? What is the house being done?

  • 新人教版高中英语必修2Unit 2 Wildlife Protection-Reading and Thinking教案一

    新人教版高中英语必修2Unit 2 Wildlife Protection-Reading and Thinking教案一

    The listening and speaking part aims at how to protect and help endangered animals by listening, speaking and talking about the facts and reasons. This lesson analyzes the decreasing clause of Tibetan antelope population and the measures of protecting Tibetan antelopes. So students can be guided to learn to analyse the title and use different reading skills or strategies, like scanning, skimming and careful reading.1. Read quickly to get the main ideas and the purpose of going to Tibetan; read carefully to understand what the author see and think.2. Understand the sentences of the present continuous passive voice such as “Much is being done to protect wildlife.” and the inverted sentence “Only when we learn to exist in harmony with nature can we stop being a threat to wildlife and to our planet.”3. Enhance the awareness of protecting wildlife.4. Cultivate the reading methods according to different materials.1. Read quickly to get the main ideas and the purpose of going to Tibetan; read carefully to understand what the author see and think.2. Understand the sentences of the present continuous passive voice such as “Much is being done to protect wildlife.” and the inverted sentence “Only when we learn to exist in harmony with nature can we stop being a threat to wildlife and to our planet.”3. Cultivate the reading methods according to different materials.Step 1 Leading-inWatch a video about elephants and whales and then ask:Why are they endangered ? They are killed/hunted

  • 新人教版高中英语必修2Unit 2 Wildlife Protection-Reading and Thinking教案二

    新人教版高中英语必修2Unit 2 Wildlife Protection-Reading and Thinking教案二

    The theme of this unit is human and nature, focusing on the theme of wildlife protection. Nature is a complex ecosystem, in which there are delicate balance between animals and plants. Because of the role of the food chain, the extinction of one species will produce influence, causing a series of chain reaction. Large scale extinction of species will have a serious and even irreversible impact on the ecosystem, resulting in immeasurable losses. Therefore, it is of great significance to protect wild species. To protect wild species is to protect human beings themselves. The motto of this unit is "when the buying stops, the killing can too,” which is a public service advertising slogan to protect wildlife. It tells people that every rhinoceros horn, every fur, every bowl of shark fin soup, every Ivory product, and every tiger bone product, etc. consumed by human beings, are innocent wild animals slaughtered behind them. The mission of wild aid is to ban illegal trade in endangered wildlife and mitigate climate change. It aims to educate the public to reduce the consumption demand for endangered wildlife products through public publicity and improve the awareness of environmental protection.1. Improve the awareness of wildlife protection by acquiring the knowledge of wildlife protection.2. Focus on environmental protection and protection of all lives.3. Analysis of the living environment of wild animals with appropriate thinking mode.4. Skillfully use the vocabulary and grammar knowledge of this unit to cultivate self-study ability according to the unit content5. Develop cooperative learning ability through discussion and other ways1. Enable the Ss to talk about the current situation of wild animals.2. Guide the Ss to summarize the main idea of each paragraph as well as the main idea of the text.

  • 新人教版高中英语必修2Unit 4 History and traditions教案

    新人教版高中英语必修2Unit 4 History and traditions教案

    这个地区有着深厚的传统。既学既练:为了让更多的外国游客了解中国文化,欣赏中国美丽的自然风光,感受中国发生的巨大变化,某外文杂志社将出版一本英语小册子来介绍中国的旅游景点。该杂志社邀请你为该小册子写一篇英语短文来介绍杭州,内容包括:1.杭州的位置(中国东南部)、面积(16 000多平方公里)及历史(2 200多年)等;2.杭州的旅游特色(自然风景、传统文化、特色小吃等);3.希望更多的游客来杭州参观。注意:1.词数80左右;2.可适当增加细节,以使行文连贯。Located in the southeast of China, Hangzhou is a beautiful city.Dating back more than 2,200 years, Hangzhou covers an area of more than 16,000 square kilometers.In Hangzhou, you can visit the West Lake, whose scenery is fascinating.In addition, you can’t miss its cultural relics and historical sites, from which you will learn more about excellent Chinese traditional culture and traditions.In Hangzhou, the special snacks are famous and visitors from different parts of the world think highly of them.As a tourist attraction, Hangzhou attracts a large number of visitors from home and abroad every year.Once you come to China, Hangzhou is a scenic spot you can’t miss.

  • 新人教版高中英语必修2Unit 5 Music-Discovering Useful Structures教案一

    新人教版高中英语必修2Unit 5 Music-Discovering Useful Structures教案一

    Step1:自主探究。1.(教材P52)Born(bear) in the USA on 2 January 1970, Whitacre began studying music at the University of Nevada in 1988.2.(教材P52) Moved(move) by this music, he said, “It was like seeing color for the first time.”3.(教材P56)I was very afraid and I felt so alone and discouraged(discourage).4.(教材P58)Encouraged(encourage) by this first performance and the positive reaction of the audience, I have continued to play the piano and enjoy it more every day.Step2:语法要点精析。用法1:过去分词作表语1).过去分词可放在连系动词be, get, feel, remain, seem, look, become等之后作表语,表示主语所处的状态Tom was astonished to see a snake moving across the floor.汤姆很惊讶地看到一条蛇正爬过地板。Finally the baby felt tired of playing with those toys.终于婴儿厌倦了玩那些玩具。注意:1).过去分词作表语时与被动语态的区别过去分词作表语时,强调主语所处的状态;而动词的被动语态表示主语是动作的承受者,强调动作。The library is now closed.(状态)图书馆现在关闭了。The cup was broken by my little sister yesterday.(动作)昨天我妹妹把杯子打碎了。2)感觉类及物动词的现在分词与过去分词作表语的区别过去分词作表语多表示人自身的感受或事物自身的状态,常译作“感到……的”;现在分词多表示事物具有的特性,常译作“令人……的”。

  • 新人教版高中英语必修2Unit 5 Music-Reading and Thinking教案一

    新人教版高中英语必修2Unit 5 Music-Reading and Thinking教案一

    This section focuses on "learning about experiencing music Online". This virtual choir is a new form of music performance. Members from all over the world don't need to love to come to a place. Instead, they use the new technology to model the various parts and wonderful virtual harmony group of music in the family. Students need to understand the main meaning of each paragraph. Finding topic sentences is an important way to understand the general idea of a paragraph. After the topic sentence, it is usually the detail sentence that supports and explains the topic sentence. Some paragraphs have obvious subject sentences, for example, the first sentence of the second paragraph is the subject sentence of the paragraph, and the following sentenceStudents need to pay attention to the topic sentences and key sentences, and then pay attention to how the sentences after the meaning explain, explain and support the topic sentences or key sentences before.1.Guide students to learn about experiencing music online2.Guide students to scan and circle the information in the text.3.Guide students to find the numbers and dates to fill in the timeline.4.Guide students to learn more about music by completing the sentences with the correct forms of the words and phrases. And then make a mind map about the outline of the passage.1. Guide students to pay attention to reading strategies, such as prediction, self-questioning and scanning.2. Help students sort out the main meaning of each paragraph and understand the narrative characteristics of "timeline” in illustrative style.3. Lead students to understand the changes that have been caused by the Internet.

  • 人教版高中地理必修1大规模的海水运动教案

    人教版高中地理必修1大规模的海水运动教案

    4.海洋污染(1)阅读书本P64,由学生归纳:(2)展示图片资料:“威望号油轮泄漏事故”【讨论】石油污染将对该海区的生态环境造成怎样的影响?【小结】本节课我们从四个方面了解了洋流对地 理环境和人类活动的影响,重点学习洋流对气候和对渔场形成的影响。同学们听说过“厄尔尼诺”现象吗?“厄尔尼诺”现象会影 响秘鲁渔场的渔获量;也会对气候产生影响,导致全球气候异常。『探究“神奇的厄尔尼诺”现象』学习小组交流【小结】“厄尔尼诺”现象还有许多不解之谜,其中之一是形成原因,尚未能解释清楚。有人认为是南半球东南信风减弱造成的,也有人认为是大气环流减弱造成的结果;且“厄尔 尼诺”现象发生有没有自身的规律?发生周期长短受什么制约?等等,这些谜团等待我们去一一解开。

  • 人教版高中地理必修1常见天气系统教案

    人教版高中地理必修1常见天气系统教案

    知识和技能 ⑴从图片和简易图中,了解气团(冷气团、暖气团)的概念;锋的概念与分类;低压(气旋)、高压(反气旋)、高压脊、低压槽的概念。⑵从气温、气压、湿度、降水、风等几方面分析各种天气系统的形成及其气流特点,并综合出各种天气系统控制下的天气状况过程与方法 ⑴让学生能阅读和简单分析天气图,解释天气变化现象;⑵用案例说明气象灾害发生的原因和危害;⑶结合我国常见的天气系统说明其对人们生产和生活的影响情感、态度与价值观激发学生探究天气的形成和变化的兴趣和动机,培养学生求真、求实的科学态度,提高地理审美情趣教学重点1.锋面系统。(锋面系统:一是要区别冷暖锋的成因,二是要掌握锋面两侧的气压、温度、湿度、风和天气差异)2.低压、高压系统。(要掌握其成因、气压特征、气流特征及其天气特点四个方面。)

  • 人教版高中地理必修1地球的运动教案

    人教版高中地理必修1地球的运动教案

    三维目标:知识和技能 1、了解地球自转和公转的方向及一些基本数据:周期、速度、公转轨道、黄赤交角。2、理解由于地球自转运动造成的昼夜交替、地方时差,掌握时间的有关换算,能正确判断晨昏线。3、理解地球自转和公转的关系,理解太阳直射点的南北移动的过程及其原因,并能演示其运动规律。4、理 解昼夜长短和正午太阳高度的季节变坏纬度变化 。过程与方法 1、通过运用地球仪演示地球的自传和公转现象,学生能够准确的画出夏至日到冬至日太阳照射地球的示意图2、能根据“二分二至日太阳照射地球示意图”分析全球各 地的昼夜长短和正午太阳高度的变化,分析同纬度地区不同季节和不同纬度地区相同季节的昼夜长短和正午太阳高度的变化。

  • 人教版高中地理必修1全球气候变化教案

    人教版高中地理必修1全球气候变化教案

    科学家预测,就地区而言,位于低纬度的大部分国家,农作物的产量将减少;而位于高纬度的国家,农作物产量有可能增加。由于不少发展中国家位于低纬度地区,因此,气候变化的这种区域差异性,可能会使发展中国家所面临的问题更为严峻。板书:3全球变暖将加剧水资源的不稳定性与供需矛盾。介绍:全球变暖会影响整个水循环过程,可能使蒸发加大,改变区域降水量和降水分布格局,增加降水极端异常事件的发生,导致洪涝、干旱灾害的频次和强度增加,以及地表径流发生变化。随着径流减少,蒸发增强,全球变暖将加剧水资源的不稳定性与供需矛盾。转折:既然全球变暖会引起很多不利影响,那么作为人类应如何面对这一挑战呢?这就是我们要讨论的第三个问题。板书:三、气候变化的适应对策讨论:请大家阅读结合教材P53气候变化的适应对策部分讨论人类应如何面对全球变暖这一问题 呢?

  • 人教版高中地理必修1山岳的形成教案

    人教版高中地理必修1山岳的形成教案

    【转折过渡】除了以上所说的褶皱山和断层山之 外,是否还有其他类型的山脉呢?试举一例说明。【学生思考后回答】有,如富士山属于火山。【教师总结】同学们回答的很好,还有火山,那么火山是如何形成的呢?这就是我们要研究的下一个问题。【板书】3、火山【指导读书】请同学们阅读教材P81思考:①玄武岩高原和火山有什么联系与区别? ②火山由哪几部分构成的?③火山的规模是否相同?【学生回答】①联系:玄武岩高原和火山都是由于处于地下深处的岩浆,在巨大的压力作用下,有时候会沿着地壳的薄弱地带喷出地表而形成的。区别:玄武岩高原是岩浆沿着地壳的线状裂隙流出,往往比较宽广。如哥伦比亚高原。火山是岩浆沿着地壳的中央喷出口或管道喷出。如我国长白山的主峰。②火山由火山口和火山锥两部分组成。③火山的规模大小不一,大火山的相对高度可达4 000~5 000米,火山口直径为数百米;小火山的相对高度不及100米。

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