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Science Rocks
Rocks
Term | Definition |
---|---|
Extrusive | Outside fast small crystals. It forms above the earth's surface. |
Intrusive | Inside slow big crystals. When a rock forms below the earths surface. |
Sedimentary Rock | Layers of particles are pressed together over time. |
Classic/Clastic | Older rocks break down and become compacted together. Pieces of old minerals. |
Organic | Made of once living materials. |
Chemical | Minerals come out of a solution and crystallize. Formed when water dissolves a mineral. |
Permanent Ripple Marks | Formed by moving water or wind. |
Cracking | Evidence of wet periods followed by dried periods |
Cross Bedding | When wind drops sand on curved slopes of sand dunes. |
Compaction | Compaction is the process by which sediments form sedimentary rock by squeezing the water out. |
Lithification | The process by which sediments harden. |
Cementation | Process of minerals dissolving and then holding the particles together in a sedimentary rock. |
Metamorphic Rock | New rocks that form from existing rocks from heat pressure or chemicals. |
Contact Metamorphism | broken down pieces of rock near the Earth's surface is altered by magma. |
Regional Metamorphism | Rocks buried deep within the Earth are altered by magma chambers. |
Banded Foliated Rocks | Foliated rocks have bands and lines. |