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Category | Format | Size |
---|---|---|
S edition fourth grade Chinese language volume 1 | pptx | 6 MB |
Description
"Discovery on the Map" PPT courseware
Multiple words in one word:
spell( )( )( )( )
Set( )( )( )( )
Suitable( )( )( )( )
live( )( )( )( )
read it
Contour, fit, zigzag, splicing,
coal, location, fit, survival,
continent, drift, jagged,
Snow-covered, dense, and difficult
anastomosing sawtooth splicing coals
location suitable for survival cliff
think
What is this text mainly about?
——The German meteorologist Wegener discovered the "continental drift theory".
collaborative inquiry
What was Wegener's hypothesis? Under what circumstances did he come up with the hypothesis?
How did Wegener prove that his hypothesis was correct?
Key sentences
"After careful observation, he further discovered that although the edges of the world's continents were as jagged as jagged edges, they could just be spliced together."
Varied: long and short, high and low. The level of description is uneven or very uneven.
Many people have seen the same world map and even studied it. Wegener did not discover this interesting phenomenon casually. What makes him different?
Observe carefully and think carefully.
How did scientists prove this hypothesis?
(1) The coal found in Antarctica has traces of plant growth and a large number of animal and plant fossils. This shows that Antarctica 200 million years ago was not covered with ice and snow now, but was an environment suitable for biological survival.
(2) The moraine in Antarctica is exactly the same as the moraine found in Oceania and Africa, indicating that they all come from the same continent.
(3) The reasoning process of "not... nor... but..."
(4) Therefore, several continents on the current earth were connected together 300 million years ago. This continent split 200 million years ago and gradually drifted to its current position.
Enlightenment
Wegener's major discoveries were based on:
Careful observation, careful thinking, and repeated demonstrations are the persistence of scientists who dare to explore the mysteries of nature.
after class homework
Excerpt four-character words from the text.
Interested students continue to search for information about the theory of continental drift.
Keywords: Discovery on the Map teaching courseware, Chinese S version fourth grade Chinese courseware, Volume 1, fourth grade Chinese slide courseware download, Discovery on the Map PPT courseware download, .ppt format
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"Discovery on the Map" PPT courseware 2:
"Discoveries on the Map" PPT Courseware 2 Observe the east coast of South America and the west coast of Africa on the map. What interesting phenomena will you find? Wei Kuohen is suitable for carrying kisses, sawing, piecing together coal, and storing cliffs. The location of the sawtooth splicing of coal blocks is suitable for survival on the cliff..
File Info
Update Time: 2024-09-09
This template belongs to Chinese courseware S edition fourth grade Chinese language volume 1 industry PPT template
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