RocksGroup2

Definitions: //**Igneous Rocks**: are formed by crystallization of melted, either magma within the earth or lava that is on the surface of the earth. mineralogical, structural, and chemical changes, in response to extreme change in temperature or pressure.
 * //__Rocks:__ A solid mineral material forming part of the surface of the earth and other planets, exposed on the surface or underlying the soil or oceans. //**
 * Metamorphic Rocks**: are rocks formed from preexisting solid rocks by
 * Sedimentary Rocks**: are formed from over burden pressure as particles of sediments are deposited out of air, ice, or water flows carrying the particles in suspension. As sediment deposition build up the overburden pressure squeezes the sediment into layered solids in a process known as lithification.


 * How igneous rocks are formed** : Magma forms the igneous rocks when it is heated to a high temperatures between 625 and 1200 degrees Celsius beneath the earths surface.
 * How Metamorphic rocks are formed** : formed by the alteration of pre-existing rocks from exposure to heat and pressure while remaining a solid form. Metamorphism occurs by breaking bonds between atoms in a mineral so that the atoms rearrange themselves into new more stable mineral forms.//
 * How Sedimentary Rocks are formed :** Sedimentary rocks are those formed from the compaction and cementation of fragments of pre-existing rocks called clasts, or plant and animal remains.

__Properties to Identify__ :
 * Igneous rock** :