Rocks of the Earth

Igneous rocks are magma that has cooled and hardened, either beneath or above the Earth's surface

Coarse-grained igneous rocks

formed when magma cools and hardens slowly in the Earth's interior

Eg. Granite

Fine-grained igneous rocks

formed when lava cools and hardens quickly on the Earth's surface.

Eg. Basalt

formed by the cementing and hardening of layers of sediments under pressure from the overlying layers

A rock that is completely transformed or changed from an igneous or sedimentary rock under intense heat or pressure

Fine-grained

Shale

Coarse-grained

sandstone

The continual process by which rocks change from one type to another