| A | B |
|---|
| lithosphere | the rigid outer shell of the earth that includes all of the crust and the rigid top part of the mantle |
| hydrosphere | the water part of the earth's surface |
| atmosphere | the layer of gases that surrounds the earth and contains the clouds |
| crust | the top layer of the earth above the mantle |
| mantle | the middle layer of the earth between the core and the crust |
| core | the center part of the earth, beneath the mantle, made up of nickel and iron |
| plate | a large section of the earth's surface made up of crust and the rigid top part of the mantle |
| plate tectonics | the theory that explains that the earth is broken into plates that move |
| new crust | this happens when two plates move away from each other |
| volcano | this happens when an ocean plate moves toward a continental plate |
| earthquake | this is formed when rocks at a fault strain against each other and the land moves suddenly |
| plate boundary | the edge of a plate |
| mountain | this is formed when two plates move towards each other |
