Rock Cycle
By: Peyton and Noah
A cycle of processes by rocks in the earths crust, involving igneous intrusion, uplift, erosion, transportation, deposition as sedimentary rock, metamorphism, remelting and further igneous intrusion
Igneous rocks are formed from magma and lava cooling formed from igneous, metaphoric, or sedimentary rocks which have melted because of plate collision and subduction. When igneous rocks are weathered and eroded they travel and then get formed to sedimentary by getting smushed together, the process is called lithification. Lithification further explained is when water is taken away by pressures. Metamorphic and igneous can be made a sedimentary by that process.
Igneous
Characteristics: Rarely react to acids, often don't have layering, usually made up of more then 2 minerals.
Example rocks: Granite, Obsidian
Formend by: Volcanos erupting (cooled magma)
Metamorphic
Characteristics: May display foliation, and can display recrystalization
Example rocks: Slate and Marble
Formend by: the minerals they contain are changed chemically, forming metamorphic rocks. Sometimes, metamorphic rocks are formed when rocks are close to some molten magma, and so get heated up.
Sedimentary
Characteristics: Stratification is visible, the presents of fossil organisms more porous and less dense then other rocks
Example rocks: Salt, Coal
Formend by: Sedimentary rocks are formed when sediment is deposited out of air, ice, wind, gravity, or water flows carrying the particles in suspension. This sediment is often formed when weathering and erosion break down a rock into loose material in a source area.