Plate Tectonics What evidence do scientists have to support the fact that the Earths crust is...
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![Page 1: Plate Tectonics What evidence do scientists have to support the fact that the Earths crust is continuously moving?](https://reader035.fdocuments.in/reader035/viewer/2022070305/55157d63550346486b8b5311/html5/thumbnails/1.jpg)
Plate TectonicsWhat evidence do scientists have to support the fact that the Earth’s crust
is continuously moving?
![Page 2: Plate Tectonics What evidence do scientists have to support the fact that the Earths crust is continuously moving?](https://reader035.fdocuments.in/reader035/viewer/2022070305/55157d63550346486b8b5311/html5/thumbnails/2.jpg)
Plate Tectonics
• The theory that describes how tectonic plates move and shape Earth’s surface
• Tectonic plates are huge pieces of crust that fit together at their edges to cover Earth’s surface.
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About 12 plates exist on Earth
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Earth’s Interior• Crust – Rigid outer shell
of Earth– Oceanic and Continental
Crust
• Mantle
– Upper mantle is partially molten
– Lower mantle is rigid (solid)
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Earth’s Interior
• Core– Outer core is
molten iron, source of Earth’s magnetic field
– Inner core is solid, Iron and Nickel
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Plate Boundaries
Divergent Boundary
Convergent Boundary
Transform Boundary
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Divergent Boundary
• Two tectonic plates move apart from each other
• Rift valleys – long narrow depressions
• Rift valley in East Africa
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Convergent Boundary
• Two tectonic plates move towards each other (come together)
• Oceanic Plates are more dense
• Continental Plates are less dense
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Subduction• Process when one tectonic plate slips
beneath another plate
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• Oceanic – Oceanic
– Subduction Occurs
– Deep Sea Trenches (Marianas Trench)
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• Oceanic – Continental
– Subduction Occurs
– Trench and Volcanic Arch (Peru – Chile Trench)
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• Continental – Continental
– Mountain Building
– Himalayas
– Aleutian Islands
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Transform Boundary
• Region where two plates slide past each other
• Earthquakes occur at transform boundaries
• San Andreas Fault in San Francisco
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