igneous

Rocks

Some examples of igneous rocks are obsidian, granite, and pumice. Igneous rocks are formed by magma. It starts when magma comes from the ground to the surface. Then it cools and makes an igneous rock. that is how igneous rocks are made. Thank you for reading my pages on groups of rocks.

http://www.sciencekids.co.nz/sciencefacts/earth/igneousrocks.html

​