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rock
| Question | Answer |
|---|---|
| Rocks: | Make up the earth's crust, that are made of a mixture of minerals and other materials |
| Classifying Rocks: | 3 ways of classifying |
| Texture: | the look and feel of the rocks surface; the grain: what gives the rock its texture. |
| Mineral Composition: | geologists use a microscope to observe the shape and size of the rock’s crystals. |
| Sedimentary: | forms in layers |
| Igneous: | forms from magma or lava |
| Metamorphic: | formed deep underground |
| Igneous Rocks Classified: | formed from intense heat that comes from magma or lava. |
| Extrusive Rocks: | igneous rocks formed from lava that erupted onto Earth's surface |
| Intrusive Rocks: | igneous rocks formed from magma that hardens beneath Earth's surface. |
| Texture: | depends upon the size and shape of the crystals |
| Porphyritic texture: | large crystals surrounded by small crystals, which form when magma cools in two stages. |
| Uses of Igneous Rocks: | Used because they are hard, dense, and durable |
| Basalt: | gravel |
| Pumice: | cleaning and polishing |
| Perlite: | soil mixes |
| Obsidian: | sharp tools |
| Granite: | building materials |
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