Notes For My Alien Friend
HELLLPPP! My teacher is an alien!
How geologists learn about the earth!
Scientists have worked to find ways to learn about earth's interior. They have found two that scientists use. One way is to get rock samples and study them. The other way to study the earth is by a thing called seismic waves. Seismic waves are the vibrations that travel through earth carrying the energy released during an earthquake.
Basalt- a dark, fine-grained rock
Granite- a rock that is usually a light color and has coarse grains
Lithosphere- a rigid layer made up of the uppermost part of the mantle and crust
Asthenosphere- the soft layer of the mantle on which the lithosphere floats