| Category | Format | Size |
|---|---|---|
| The first volume of Chinese language for eighth grade compiled by the People's Education Publishing House | pptx | 6 MB |
"Two Short Essays by Asimov - The Flattened Sand" PPT courseware
Description
"Two Short Essays by Asimov - The Flattened Sand" PPT courseware
1. Regarding the extinction of dinosaurs 65 million years ago, what two opposing theories exist in the scientific community? What is the basis for each?
In the scientific community, there are two opposing theories regarding the extinction of dinosaurs 65 million years ago: the "impact theory" and the "volcano theory."
The basis for the "impact theory": In a thin layer of sediment formed 65 million years ago, the rare metal iridium was found in an unusually abundant amount. Some believe this could be the result of a giant asteroid or comet impacting Earth. The impact may have penetrated deep into the Earth's crust, causing volcanic eruptions that caused fires and tidal waves.
2. Why does the article give examples of quartz and diamond?
Used as evidence: Ordinary sand turns into dense "Si quartz" under ultra-high pressure. "Si quartz" rebounds for millions of years in its natural state and returns to sand. In the laboratory, if you heat "Si Quartz" coffee at a high temperature of 850 degrees Celsius for 30 minutes, it will turn into ordinary sand.
This proves that the formation of "diamond" is similar to that of quartz. Use the familiar "diamond" analogy to help ordinary people understand this truth. )
It is concluded that in nature, where the quartz appears there must have been a huge impact, resulting in high pressure, and there must have been no volcanic activity.
Author's ideas
Based on the results of scientific discoveries and scientific experiments, the author clearly explains that the cause of the extinction of the dinosaurs was the result of a huge asteroid or comet impacting the earth.
The order of explanation: scientific discovery → generation of opinions → scientific research discoveries → confirmation of opinions. This is a logical sequence of explanation from cause to effect.
Compare reading
(1) Compared with the short article "Dinosaurs Are Everywhere", what are the similarities and differences in the writing ideas of the two short articles?
(2) What are the similarities in the way the two articles think about problems in the process of exploring the mysteries of nature?
(3) Both short articles talked about the extinction of dinosaurs, but from different angles.
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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...
"Two Short Essays by Asimov" PPT download:
"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 when he was a child...
"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: 2024-08-06
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