| A | B |
|---|
| mesosphere | third layer of atmosphere; meteorites burn up here |
| lithosphere | made up of crust and uppermost mantle |
| mantle | outer layer of earth; upper part is liquid |
| outer core | liquid layer of earth, mostly Ni and Fe |
| inner core | solid core of earth, very hot but pressure keeps it solid |
| asthenosphere | molten part of mantle |
| mantle convection | currents in magma the move tectonic plates |
| spreading center | rising magma pushes plates apart |
| rift valley | spreading center on land |
| subduction zone | oceanic plat goes under continental plate |
| slab pull | sinking magma pulls plate down |
| ridge push | rising magma at spreading center forces plates apart |
| diverging boundary | plates moving apart |
| converging boundary | plates coming together |
| volcanic island arc | form due to the convergence of two oceanic plates |
| transform plate boundary | one plate is sliding past the other |
| focus | location inside the earth where an earthquake happens |
| epicenter | location on earths surface where earthquake is felt |
| primary wave | first earthquake wave to arrive (fastest) |
| secondary wave | second earthquake wave to arrive |
| surface wave | wave like ripples in a pond |
| seismometer | measures earthquakes |
| seismogram | graph showing earthquake waves |
| composite volcano | large, mountain like volcano found at subduction zones |
| shield volcano | low wide volano that has frequent laval flows |
| rift eruption | lava flows through large cracks in the lithosphere |
