"Two Short Essays by Asimov" PPT download

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"Two Short Essays by Asimov" PPT download

Part One: Learning Objectives

1. Clarify the ideas of the article.

2. Compare and analyze the illustrative objects and illustrative angles of the two essays.

about the author

Asimov, an American Jew, left his native Russia for the United States when he was a child. He studied biochemistry in his youth, and later devoted himself to writing and became one of the most prolific writers in the world. He has won the Hugo Award and the Nebula Award, which represent the highest honors in science fiction literature. He has published more than 300 science fiction novels and popular science works so far, and is recognized as the leading science fiction writer in the United States today.

Background introduction

For a long time, people have tried to explain the origin of the earth's land and oceans, and various hypotheses have been proposed. Now, geologists generally believe that 200 million years ago, all the continents on the earth were connected together. Later, for some reason, this super ancient continent was divided into two, and then divided into two, forming successively North America and Eurasia, Antarctica, Africa, South America, Oceania, New Zealand and the Indian subcontinent. This is the theory of continental drift that has caused a profound revolution in geology. In 1986, experts from the Argentine Antarctic Institute discovered dinosaur fossils in Antarctica, which provided strong evidence for this theory.

Part Two: Word Accumulation

1. Read

remains toad folds

disaster amphibian ornithischia

2. Make a note

Drift: A floating object moves in a certain direction.

Relocation: Leaving the original location and changing location.

Remains: The bones left behind.

Folds: bends formed by compression of rock layers due to crustal movement.

Disaster: Disaster.

Seamless clothing: According to myths and legends, the heavenly clothing worn by fairies has no seams. There is no flaw in the metaphor.

Part Three: Overall Perception

Listen to and read the text, and combine it with the pictures displayed on the large screen to understand the content of the text, clarify the author's writing ideas, and prepare to retell it.

collaborative inquiry

1. First reading of the text Discussion content

Analysis of "Dinosaurs Are Everywhere"

This article proves the _________ hypothesis based on the facts of ____________________.

The objects explained in the text involve two subjects, namely: _______________ __________________

From this we understand something:

Different subject areas are closely connected. Discoveries in one field of science will certainly have consequences in other fields.

2. Read the text and appreciate the language

Compare the differences between the following two sentences and the original text, and tell which expression is more effective.

(1) There are many continents on the plate. When the plate moves in one direction or another, the continents also move together.

(Original sentence: The plates carry many continents on their backs. When the plates move in one direction or another, the continents also move with them.)

The original text uses anthropomorphic rhetorical techniques, which is more vivid and vivid than the revised text.

(2) After this Pangea existed for millions of years, it began to break up again. (Original text: After millions of years of existence, Pangea began to show signs of breaking up again.)

The original article explains that this Pangea is still very strong, but there are just some signs and signs of breaking up, not that it has begun to break up. The revised text does not conform to scientific reality.

(3) In the sixth paragraph, "It is the continents that are drifting, not the dinosaurs that are migrating." Are "drift" and "migration" interchangeable in this sentence, and why?

Not interchangeable. Because "drift" means that inanimate things move with the help of external forces, and "migration" means that living things move to a certain place with a purpose. After changing, it will not be accurate.

Part 4: Flattened Sand

Background introduction

As discussed in the previous article, the author explores the cause of death of dinosaurs through "flattened sand" - once again proving that "different scientific fields are closely connected. New discoveries in one scientific field will definitely have an impact on impact in other areas."

word accumulation

1. Read

dense diffusion repulsive

Meteorite melting trace

2. Make a note

Emergency: To meet urgent needs.

Dense: meticulous and precise.

Exclusion: To keep other people or things away from oneself.

Diffusion: Expand and spread out.

Meteorites: meteorites that contain a lot of stone or are entirely stone.

Melting: Heating a solid to change it into a liquid.

Traceability: The original meaning is to go against the current. It is often used as a metaphor to explore the origin of things.

Part Five: Overall Perception

What two scientific hypotheses does this article propose about why the dinosaurs became extinct? Please explain these two doctrines.

Explain the "impact theory" and "volcano theory":

Impact theory: The devastating impact of a huge asteroid or comet on the earth was the cause of the extinction of many earthly creatures, including dinosaurs.

Volcano theory: The earth suddenly experienced a period of volcanic eruptions, which caused the extinction of a large number of creatures, including dinosaurs.

collaborative inquiry

1. Read the text silently to clarify your views

Which theory does the author think is correct? How is it proved?

The author believes that the "impact theory" is correct.

How did scientists prove the "impact theory"?

(1) Take the examples of quartz and diamond;

Analyze scientists’ proof ideas:

Ordinary sand will turn into dense "Squartz" under ultra-high pressure

After tens of thousands of years of rebound in its natural state, "Si quartz" will turn into sand again

In nature, where quartz appears there must have been a huge impact, resulting in high pressure, and there must have been no volcanic activity.

(2) Take the example of rocks in the Raton area of ​​New Mexico:

Proof idea:

Stone quartz has been found in places in Raton, New Mexico, and there is evidence that these areas were once struck by giant meteorites. The huge pressure generated by the impact formed "Sternite".

2. Study the text and appreciate the fine paragraphs

Analyze sections 2-5 of the text:

1. What does the discovery of metallic iridium indicate?

It shows that the earth may be hit by an asteroid or comet.

2. What caused the extinction of the dinosaurs?

The impact of huge asteroids or comets on the earth caused volcanic eruptions, fires and tidal waves, which caused a lot of dust to enter the stratosphere, preventing sunlight from reaching the earth's surface for a long time, leading to the extinction of the dinosaurs.

3. What does the author think is the purpose of studying the "impact theory"? (Answer in the original words of the article)

Because we may encounter a catastrophe of one kind or another in the future. We need to understand as much as possible about the impact of such an event so that we can take some kind of contingency measures when faced with such an event in the future.

4. "However, not all scientists believe it was caused by a giant impact." Can the "all" be deleted from this sentence? Why?

It cannot be deleted; because after deletion, it cannot be emphasized that only some scientists hold this view, and the author's explanation below cannot be highlighted, which is not in line with the actual situation.

Part Six: Expansion and Extension

Please choose any guess, start imagining and associating accordingly, and verbally express what it would have been like when the dinosaurs on land became extinct.

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For more information about the PPT courseware "Two Asimov's Short Essays, Dinosaurs Are Everywhere, Squashed in the Sand," please click on the PPT tag of Asimov's Two Essays, PPT Squashed in the Sand, Dinosaurs Are Everywhere.

"Two Short Essays by Asimov" PPT teaching courseware:

The first part of the PPT teaching courseware "Two Essays by Asimov": Learning objectives of the first lesson 1. Memorize the pronunciation of the words "fold" and "amphibious"; memorize the glyphs of the words "carrying bones to trace the tide"; understand the ice and snow The meaning of idioms such as seamless; understand that...

"Dinosaurs Are Everywhere" PPT:

"Dinosaurs Are Everywhere" PPT Part One Content: New Lesson Introduction Author Introduction Asimov was born in the small town of Petrovich near Smolensk in the Soviet Union. He liked reading science fiction novels since he was a child. He wrote a science fiction novel when he was 15 years old. In the same year, he was admitted to Columbia University.

"Two Short Essays by Asimov" PPT:

"Two Short Essays by Asimov" PPT Part One Content: New Lesson Introduction Learning Objectives 1. Understand the reasons for the extinction of dinosaurs revealed in the article, and grasp the author's views explained in the two short essays. (Key points) 2. Clarify the order of explanations, analyze explanation methods and their functions, and understand...

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Update Time: 2024-07-03

This template belongs to Chinese courseware The second volume of Chinese language for eighth grade compiled by the People's Education Publishing House industry PPT template

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