rock and types

What is rock?

Rock is a hard solid substance composed of one or more minerals.

Basically there are three types of rocks

1.Igneous rock

2.Sedimentary rock

3.Metamorphic rock

Igneous rock are the condensed lava that come out of the core of earth and cool down on the surface. When the tectonic plates of earth move causing volcano eruption lava come out from the inner core of earth, this molten lava when settles down on the crust and cools down it solidifies to form hard structure called rock

Igneous rock are of two type: basaltic rock (basalt) and granite

Basalt is formed by cooling of the molten lava on the surface of earth. It is a very fine grained rock

Granite is formed when lava from the core looses its force while come out to earth crust, some lava gets trapped along with the crust i.e , lava gets combined with the coarse soil and after cooling it solidifies in the form of a coarse grained rock

Sedimentary rock, these rocks are formed by the deposition of sediments formed by the weathering of other earthly structures. When the deposits from various sources like wind and water settles down on each other, the continuous pressure exerted by the upper layer hardens the layers beneath forming a hard structure. This hard structure is called sedimentary rock

Metamorphic rock, these rocks are formed when sedimentary rocks present inside the layers of earth undergoes changes in the presence of pressure and heat.