| A | B |
|---|
| landforms | physical features on Earth's surface |
| weathering | the process of breaking rock into silt, sand, clay, and other tiny pieces of sediment |
| sediment | tiny pieces of rock, silt, sand, and clay |
| erosion | the process of moving sediment from one place to another |
| deposition | the process of dropping, or depositing, sediment in a new location |
| mass movement | the downhill movement of rock and soil because of gravity |
| crust | the outer layer of the Earth, made of rock |
| mantle | the layer of rock beneath Earth's crust |
| core | the center layer of Earth |
| plates | rigid blocks of crust and upper mantle rock |
| volcano | a mountain formed by lava and ash |
| magma | molten rock from Earth's mantle |
| earthquake | a shaking of the ground caused by sudden release of energy in Earth's crust |
| faults | places where pieces of the crust move |
| Continental draft | the theory of how Earth's continents move over its surface |
| Pangea | a super continent when all of Earth's land was joined together |
| fossils | the remains or traces of past life found in some rocks |
| glaciers | thick sheets of ice |
| dunes | large mounds of sand |
| delta | land at the mouth of a river form by deposits from a river |
| flood plain | flat land that is near the edges of a river and is formed by the silt deposited by floods |
| mid-ocean ridges | mountains under the ocean |
| lava | magma that reaches the Earth's surface |
| ash | small pieces of hardened lava |
| Ring of Fire | where many volcanoes are located at plate boundaries around the Pacific plate |
| destructive force | forces that destroy land |
| constructive force | forces that build land |
| seismic waves | energy from earthquakes |
| seismograph | an instrument that measures seismeic waves from earthquakes |
