| Category | Format | Size |
|---|---|---|
| Zhejiang Education Edition Seventh Grade Science Volume 1 | pptx | 6 MB |
"Plates on the Earth's Surface" PPT
Description
"Plates on the Earth's Surface" PPT
Part 1: Think about it
Why do the majestic Himalayas tower into the clouds? Why is the vast Atlantic Ocean still growing?
continental drift theory
One day in 1910, the German geophysicist Alfred Wegener was lying in bed. He looked at the map on the wall, and suddenly his eyes lit up. What did he find?
Africa and South America may have been connected together
Continents are drifting, that is, all the continents on the earth were once connected, and then split and drifted to their current position.
PPT on the Earth's surface, Part 2: Evidence
1. Topographic evidence
He discovered a very strange fact. There is a mountain range running from east to west in South Africa that connects with a mountain in Argentina. It was also discovered that the coastlines on both sides of the Atlantic Ocean corresponded to each other, and even the rocks and folds in the two places matched.
2. Biological evidence
The two continents are far apart, but they have similar animals
3. Fossil evidence
Wegener also discovered a kind of fossil - the fossil of lingual fern, which is a kind of fern 250 million years ago. Fossils of lingual fern have been found in Africa, South America, Australia, India and Antarctica. Due to the stone The "seed" of a fern is too large to drift in the wind, and on the other hand it breaks easily and is unlikely to drift across the sea.
4. Climate evidence
① Tropical plant fossils were discovered on islands north of the Arctic Ocean;
② Huge coal seams were discovered in Antarctica;
③ Glacier scratches were discovered in South Africa.
PPT on the plates on the earth's surface, part three: thinking and discussion
Does the "seafloor spreading theory" support the "continental drift theory"? What problem does it solve with the "continental drift theory"?
Supported the theory of continental drift,
The source of power for continental drift is solved.
With the development of marine geology, paleomagnetism, geophysical science, etc.,
People created the theory based on the "continental drift theory" and "seabed spreading theory"
A new theory of earth's structure - the theory of plate tectonics.
1. The Earth’s lithosphere is divided by ocean ridges, trenches and huge mountains.
2. The world is composed of six major sectors.
Six major sectors:
Eurasian plate,
African plate,
American Plate,
Antarctic Plate
Indian Ocean Plate,
Pacific Plate.
3. These plates "float" on the asthenosphere, constantly colliding and splitting with each other.
Generally speaking, the interior of the plate is relatively stable, and the area where the plates meet has some tension and tension, some collision and compression, and the crust is relatively active.
PPT on the Earth's surface, Part 4: Practice
1. Plate tectonics theory divides the Earth’s lithosphere into --- ( )
A. Five major sectors B. Six major sectors
C.Seven major sectors D.Eight major sectors
2. The plate floats on ------------- ( )
A. On the asthenosphere B. On the lithosphere C. On rocks D. On the crust
3. The plates that are all located in the ocean are ----------- ( )
A. Indian Ocean Plate B. Atlantic Plate
C.Pacific Plate D.Arctic Ocean Plate
4. The following are not formed by plate collisions ------- ( )
A.Mountain B.Volcano C.Earthquake D.Muds flow
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"Plates on the Earth's Surface" PPT courseware:
"Plates on the Earth's Surface" PPT courseware Part One: Evidence Fossil evidence Glossary fern fossil ----- It is a fern that lived 250 million years ago. Scientists have discovered fossils of tongue ferns in Africa, South America, Australia, India and Antarctica. Thinking and..
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Update Time: 2024-07-06
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