| A | B |
|---|
| S wave | a slower type of seismic that moves the ground up and down or side to side |
| P wave | a type of seismic wave that causes rock particles to be alternately squeezed together and spread apart. |
| mid-ocean ridges | a chain of underwater mountains.near the center of the oceans where new ocean floor is produced |
| topographic map | a map that shows the surface features of an area |
| fault | a break in Earth's crust where masses of rock slip past each other |
| seismogram | the record of an earthquake's intensity made by a device that records ground movement. |
| plate boundaries | the area between two sections of Earth's lithosphere and crust |
| upper mantle | the portion of hot, solid material in EarthÂ’s interior that is closest to the crust |
| reverse fault | a crack in Earth's surface where the sides move in opposite directions |
| outer core | a layer of molten iron and nickel that surrounds the inner, solid center of Earth |
| divergent boundaries | a plate boundary where two plates move away from each other |
| transform boundaries | a plate boundary where two plates move past each other in opposite directions |
