click below
click below
Normal Size Small Size show me how
Rock Types
6th Grade Earth Science
Term | Definition |
---|---|
Rock | A combination of one or more minerals or organic matter. |
Composition | What something is made up of. (Example - The rock Granite's composition is silica minerals) |
Texture | The characteristics related to the grain size. |
Intrusive Igneous Rock | When magma pushes into surrounding rock below Earth's surface and cools. |
Extrusive Igneous Rock | When lava erupts onto Earth's surface and cools. |
Clastic Sedimentary Rock | Forms when sediments are buried, compacted, and cemented together by calcite or quartz. |
Chemical Sedimentary Rock | Forms when water, usually seawater, evaporates. |
Organic Sedimentary Rock | Forms from the remains, or fossils, of once-living plants and animals. |
Foliation | Process in which minerals are arranged in planes or bands. |
Foliated Metamorphic Rock | Formed when rock is exposed to high temperature and pressure, causing the rock's mineral grains to look like planes or bands. |
Nonfoliated Metamorphic Rock | Formed when rock is exposed to high temperature and pressure, where the mineral grains may change size or shape but don't arrange themselves into bands/planes. |