Rocks

Major Types of Rocks

Igneous Rocks

• As igneous rocks form out of magma and lava from the interior of the earth, they are known as primary rocks. The igneous rocks (Ignis – in Latin means ‘Fire’) are formed when magma cools and solidifies.
• When magma in its upward movement cools and turns into solid form it is called igneous rock. The process of cooling and solidification can happen in the earth’s crust or on the surface of the earth.
• Examples: Granite, gabbro, pegmatite, basalt, volcanic breccia and tuff.

Sedimentary Rocks

• The word ‘sedimentary’ is derived from the Latin word sedimentum, ....