By: Taylor Mann
Type of Rocks
Rocks are mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil or oceans.
- Melting and Solidification
- Can be formed deep within the earth or outside volcanoes.
- Intrusive: Rocks that largely crystallize slowly inside the earth's crust.
- Extrusive: Rocks that form smaller crystals quickly on the earth's surface.
- Compaction and Cementation
- Found on the earth's surface.
- Clastic: Made or different sized particles cemented together.
- Bioclastic: Rocks formed by the accumulation of plant and animal remains.
- Crystalline: Deposited when chemicals in seawater precipitate and fall to the ocean bottom.
Examples of Different Rocks
- Slowly formed inside the earth (Intrusive).
- Light in color, low density, felsic
- 25% potassium feldspar, 50% quartz, 15% plagioclase feldspar, 10% amphibole.
- Chemically formed
- Crystalline texture
- Fine to coarse crystals
- Halite composition
- Crystals from chemical precipitates and evaporites.
The Rock Cycle
The rock cycle is a model showing how rocks and sediments change over time.