The Structure of the Earth and Plate Tectonics

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Presentation transcript:

The Structure of the Earth and Plate Tectonics

One small addition to yesterday’s notes… Crust = 5 – 100 km thick Mantle = 2,900 km thick Core = radius of 3,430 km

Let’s watch a short video!Click Me!

Continental Drift: Pangaea Continental Drift: the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations. Click me!

Evidence of Continental Drift The continents fit together like puzzle pieces Fossils of plants and animals were found in multiple continents; even some across oceans Similar rocks and climate evidence were found on several continents Click me!

Mid-Ocean Ridges Mid-ocean ridges are underwater mountain chains that run through Earth’s ocean basins. They are places where sea-floor spreading takes place Sea-floor spreading is the process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies As tectonic plates move away from each other, the sea floor spreads apart, and magma fills in the gap. New crust fills in the ridge as older crust gets pushed away.

Sea floor spreading video

Mid-Ocean Ridge