| A | B |
|---|
| atmosphere | The mixture of gases that surround the earth |
| hydrosphere | All the parts of the earth that are water |
| lithosphere | The earth's crust plus the rigid upper part of the mantle |
| plate tectonics | A theory that states that the lithosphere is made of plates that move ery slowly |
| earthquake | A shaking and trumbling of the earth's crust |
| fault | A break in the earth's crust |
| focus | A point underground where the vibration of a earthquake begin |
| seismograph | A instrument that measures and records earthquake waves |
| volcano | An opening in the earth which molten rock materials reaches the earth's surface |
| magma | Molten rock mixed with gases within the earth |
| lava | Molten rock that reaches the surface of the Earth |
| fault-block mountain | A mountain formed when a block of rock is raised along a fault |
| folded mountain | A mountain formed when rock layers are squeezed together |
| volcanic mountain | A cone shaped mountain formed of layers of lava and ash |
| dome mountain | A mountain formed when a large area of the earth's surface is slowly bent upward |
