Platetechtonics. Continental Drift The theory discovered by Alfred Wegener that states the...
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Transcript of Platetechtonics. Continental Drift The theory discovered by Alfred Wegener that states the...
![Page 1: Platetechtonics. Continental Drift The theory discovered by Alfred Wegener that states the continents were once connected but later drifted apart to their.](https://reader037.fdocuments.in/reader037/viewer/2022110207/56649d6f5503460f94a50622/html5/thumbnails/1.jpg)
Platetechtonics
Plate techtonics
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Continental Drift
The theory discovered by Alfred Wegener that states the continents were once connected but later drifted apart to their current locations.
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Evidence supporting continental drift
1) Shapes of the continents- The continents fit together like a jigsaw puzzle.
The first piece put in place was the Eastern side of South America and the Western side of Africa
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Evidence supporting continental drift
2) Matching geological structuresMountain Ranges:- Mountain Ranges on one continent end at
the coast and appear to continue on a different continent
Types of rock:- Similarities between the fold and age of
rocks were found on different continents
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Evidence supporting continental drift
3) Matching Fossils: - The fossils of one species were found on two
separate continents.
- Of these the most important was a freshwater reptile found in Africa and South America(it would not be able to cross the ocean)
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Evidence supporting continental drift3) Paleoglaciation: When glaciers move forward or retreat they
leave u-shaped valleys in the earth.- Many of these were found in tropical parts of
Africa and South America : These places are now found in the tropics where glaciers would not form
- The pattern of the glaciers on these continent only make sense if the continents were together at some point
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Layers of the Earth
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Layers of the Earth
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Layer of the Earth
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Layers of the Earth
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Layers of the EarthCrust: Outer most layer. Made of solid brittle
rockLithosphere: Contains the crust and the
uppermost mantle. Made up of the tectonic plates
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Layers of the EarthCrust: Outer most layer. Made of solid brittle
rockLithosphere: Contains the crust and the
uppermost mantle. Made up of the tectonic plates
Athenosphere: found above the upper mantle. Made up of partly molten rock
Mantle: the thickest layer on the earth. Broken into two parts upper and lower
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Layers of the EarthCrust: Outer most layer. Made of solid brittle rockLithosphere: Contains the crust and the uppermost
mantle. Made up of the tectonic platesAthenosphere: found above the upper mantle. Made
up of partly molten rock Mantle: the thickest layer on the earth. Broken into
two parts upper and lowerUpper Mantle: Made of partly molten rock containing
Fe and Mg (lava the consistency of toothpaste)Lower Mantle: Solid dense material also containing
Mg and Fe
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Layers of the Earth
Outer Core: A liquid made mainly from iron and nickel
Inner Core: A solid mixture of mainly iron and nickel at 5000 – 6000 C. The high pressure makes it solid