By: Destiny Diciccio
What is a rock?
the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil or oceans. There are many different types of rocks in the world and many come in different shapes and sizes. Some names of rocks would be igneous rock , sedimentary rocks , metamorphic rocks and etc. Rocks come in all different grain sizes and textures and are formed from many places including the ocean and volcanoes.
- Igneous Rocks are formed by cooling and crystallization of molten rocks (600-1000 C).Igneous rocks are formed when volcanoes erupt. The main types of igneous rocks are extrusive igneous rocks and they cool very fast and their created by lava. Another igenous rock is intrusive ingeous rock and they cool very slowly benaeth the suface and its created by magma.
- Sedimentary Rocks are formed when sediment is deposited out of air , ice , wind , gravity or water flows carrying the particles in suspension. Sedimentary rocks are types of rock that are formed by the deposition of material at the earths surface and within bodies of water. The different type of sedimentary rocks are clastic sedimentary rocks which is made of different sized particles cemented together , bioclastic (organic ) sedimentary rocks with are formed by the accumulation of plant and animal remains, and last but not least crystalline sedimentary rocks which is deposited when chemicals in seawater precipitate and fall to the ocean bottom.
- Metamorphic rocks form when other rocks are exposed to heat and or pressure without melting.Rocks can be metamorphosed simply by being at great depths below the Earth's surface, subjected to high temperatures and the great pressure caused by the immense weight of the rock layers above. The main types of metamorphic rocks are regional metamorphism which is large masses of rock changed by deep burial within earth and contact metamorphism which is chemical and physical change to a rock caused by nearby intrusion or extrusion of molten rock.
- Mostly clay minerals
-Fine to coarse
- Sand (0.006 to 0.2 cm)
- Clastic (Fragmental)
- Fine to coarse
- Calcite and/ or dolomite
- Regional or contact
- Metamorphism of limestone or dolostone
- Fine and Non - Vesicular
- Less than 1 mm
- Color is darker , Density is higher , and composition is rich in Fe, Mg.
- 75% Plagioclase Feldspar , 40% Pyroxene , and 25% Olivine