What are the three different type of rock?

Answer 1

The three rock types are sedimentary, igneous, and metamorphic. At one time, early in Earth's history, all rocks were igneous, having solidified from molten rock. From a textural point of view the differences are as follows: Sedimentary: grains of similar or differing sizes showing variable sphericity and roundness either grain or matrix supported. Igneous: crystalline grains interlocking but not showing any preferred orientation. Metamorphic: crystalline grains (for the most part except low grade metamorphic rocks) interlocking, showing preferred orientation (alignment) and associated metamorphic minerals such as garnet, kyanite and sillimanite for example. Formation:Igneous rocks, which are formed from magma cooling underground, or lava above ground are formed from previous igneous, metamorphic, or sedimentary rocks which have become melted, usually as a result of plate collision and subduction. When these igneous rocks are exposed to weathering and erosion, they break down into smaller particles that are transported by wind and water to a place of deposition, where they can form into sedimentaryrock strata, through a process of lithification, where excess water is squeezed out by overburden pressures and the particles are cemented together by various minerals precipitating out of solution. Igneous and metamorphic rocks can both be turned into sedimentary rocks in this way. Igneous and sedimentary rocks can also be changed by heat and/or pressure into metamorphic rocks, by transforming their existing mineral structures into new minerals or realigning the existing minerals. There are different degrees of metamorphism, so even an existing metamorphic rock can become a different metamorphic rock.