Earth Science

1. the location where the earthquake actually originates.
5. a type of plate boundary where two plates move away from each other.
9. refers to the extent of ancient glaciers and rock markings left behind.
11. the area from the crust to the upper portion of the upper mantle.
15. the location of a earthquake on the surface directly above the focus.
16. a type of body wave that is second to arrive. the ground motion is perpendicular to the direction of the wave travel through solids.
17. a surface wave that is the slowest to arrive. since it travels along the Earth's surface, the ground motion is a rolling action like ripples in a pond.

2. the act in which the heavier plate goes under the lighter plate. usually occurs when a oceanic plate is present.
3. the shaking of the Earth's surface resulting from the release of accumulated energy caused by the movement of tectonic plates.
4. core: layer made up of a mixture of iron and nickel. This layer is liquid unlike the other layers.
6. formations that are created when a oceanic plate subducts under a continental plate or when a oceanic plate subducts under another oceanic plate.
7. spot: an area where molten rock rises to the Earth's surface.
8. a type of plate boundary where two plates come together.
10. the Earth's thickest layer. It is mostly solid and makes up 70% of Earth's mass.
12. the type of plate boundary in which the plates move along each other.
13. core: mostly made up of solid iron, at 5000 degrees to 6000 degrees. Is located at the center of the Earth.
14. a body wave that arrives the fastest. the ground squeezes and stretches in the direction of the travel through solids, liquids and gases.