Composition of the Earth

9.2  Composition of the Earth
Types and Characteristics of Rocks

Igneous rock

Formed from the process of cooling and freezing of magma or lava that flows out of the mantle.

Contains various minerals.

Sedimentary rock

Formed by compression of deposited materials carried by the rivers, glaciers and wind

Consists of many layers which are sometimes hollow and contain fossils.

Metamorphic rock

Formed when igneous rocks or sedimentary rocks are exposed to very high pressure and temperature.

Usually harder than the original rocks that formed them