| Term | Definition |
|---|
| model | an idea of something that can't be fully known or seen |
| geologists | are scientists that study the Earth* |
| inner Core | consists of mainly solid iron and Nickle. Can reach up to 7000 degreesC |
| outer Core | Thought to be liquid because the pressure isn't great enough to make molten rock into a solid. |
| mantle | makes uo about two thirds of Earth's mass. |
| crust | radiates heat into the atmosphere. |
| focus | where the rocks break below the surface |
| seismic waves | what causes things to move during an earthquake |
| epicentre | The point on the surface directly above the focus. epi means above. |
| Richter Scale | a logarithmic scale of 1 to 10 used to express the energy released by an earthquake |
| volcano | an opening in Earth's crust through which solid and molten rock, ash, and gases escape. |
| lava | rock that in its molten form (as magma) issues from volcanos |
| ash | the residue that remains when something is burned |
| weathering | refers to the mechanical and chemical process that breaks down rocks by means of water, glacial ice, wind, and waves. |
| erosion | occurs when the products of weathering are transported from place to place. |
| deposition | the process of these naterials being laid down or deposited by wind. |
| mechanical weathgering | happens when rock is broken apart by physical forces. |
| chemical weathering | happens when water and oxygen react with the minerals in rocks to produce new minerals. |
| sediment | the [rocess of the river carrying silt, sand, mud and gravel |
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