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  • Layers of the Earth
  • Today were going to be talking about the layers of the earth
  • Least to Most dense
  • Crust
  • Mantle
  • Inner Core
  • Outer Core
  • Every layer has a name: Crust, Mantle, Outer Core, and the Inner Core. They all are dense but differ in each layer
  • The Mantle has something called convection currents. These currents flow and are in constant motion, moving lava, cooling then getting warm. Over and over while rising and falling. There are also two spaces in between the Crust and Mantle called the lithosphere and asthensosphere. The lithosphere is known for its rigid property under the crust, and the asthenosphere is the start of the mantle and where convection starts to occur.
  • Alfred Wagner
  • Continental Drift
  • There is an idea called continental drift. This idea means that earth's tectonic plates shift, causing areas of the earth to spread apart and drift way. The constant moving of them are what causes earthquakes. There is also a chance of Pangaea coming to form again, but that's not for a long time.
  • There is also a factor called plate tectonics. The plates of the Earth can come together, creating mountains, can diverge away from each other creating rifts in the crust on land or underwater. Some plates can even go over each other or under each other, making subduction zones in the oceans.
  • Sometimes when the plates collide with each other, they create waves of energy called earthquakes. They come is Primary, Secondary, and Surface waves. Each of them are similar yet are different speeds and effects on the earth.
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