Plate techtonics Continental Drift The theory discovered by Alfred Wegener that states the continents were once connected but later drifted apart to their current locations Evidence supporting continental drift ID: 513998
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Platetechtonics
Plate
techtonicsSlide2
Continental Drift
The theory discovered by Alfred Wegener that states the continents were once connected but later drifted apart to their current locations.Slide3
Evidence supporting continental drift
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 AfricaSlide4
Evidence supporting continental drift
Matching geological structures
Mountain 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 continentsSlide5
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)Slide6
Evidence supporting continental drift
3)
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 pointSlide7
Layers of the EarthSlide8
Layers of the EarthSlide9
Layer of the EarthSlide10
Layers of the EarthSlide11
Layers of the Earth
Crust:
Outer most layer. Made of solid brittle rockLithosphere: Contains the crust and the uppermost mantle. Made up of the tectonic
platesSlide12
Layers of the Earth
Crust:
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 lowerSlide13
Layers of the Earth
Crust:
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
Upper Mantle:
Made of partly molten rock containing Fe and Mg (lava the consistency of toothpaste)
Lower Mantle:
Solid dense material also containing Mg and FeSlide14
Layers of the Earth
Outer Core:
A liquid made mainly from iron and nickelInner Core: A solid mixture of mainly iron and nickel at 5000 – 6000 C. The high pressure makes it solid