ROCK CYCLE | rockcycle

THE ROCK CYCLE

there are three main types of rock that are in the rock cycle:

1 / Sedimentary

2 / Metamorphic

3 / Igneous

Each of these type of rocks can change back and forth to different forms if they are in the right place where the conditions and environment is right. Firstly, lets look at the formation of each rock ...

1 / Sedimentary Rocks

Sedimentary rocks are made out of sand, shells, pebbles, and other fragments of material, these materials have been deposited as they are being pressured by water, wind or ice. these materials build up in layers (only in cold temperature), and the weight of the top layers compresses the bottom layers. The compression squeezes out water, leaving salt crystals that cement the rocks together.

example : chalk, limestone, sandstone and shale

2 / Metamorphic

Metamorphic rocks are formed under the surface of the Earth, and Earth movements can cause rocks to be deeply buried or squeezed. As a result, the rocks are heated and put under great pressure when they are underground. However, they do not melt, but the minerals they contain are changed chemically, this will then form metamorphic rocks.

example : slate, gneiss and marble

3 / Igneous

Igneous rocks are formed when magma, a rock that melts that contains melted minerals, cools and solidfies. magma is made when the inside of the earth is hot enough to melt the molten rock (magma) or it erupts onto the surface from volcanoes.

example : basalt, obsidian and

granite

So how does each form of rock change to another form??