| A | B |
|---|
| convection current | the cycle in which hot magma is forced upward toward Earth's surface, becomes cooler and denser as it rises, then starts to sink back down into the mantle |
| earthquake | the shaking of Earth produced when sudden movement occurs along a fault and quickly releases energy |
| epicenter | the point at which the waves of an earthquake hit the surface of the Earth, directly over the focus |
| focus | the exact spot inside Earth where an earthquake starts |
| volcano | a place where hot, liquid magma is forced up through the surface |
| fault | a feature of Earth's crust where plates rub against each other and build energy that is released in waves |
| inner core | the solid, innermost layer of the Earth |
| mantle | the thickest layer inside Earth, located beneath the mantle and above the inner core |
| plate | a large section of Earth's crust and upper mantle that moves around on the plastic-like layer within the mantle |
| outer core | liquid area that surrounds Earth's center |
