Describe how Sedimentary Rocks and Igneous Rocks are formed. Give two examples of each.

The Sedimentary rocks are formed from material derived from the pre-existing rocks and from organic sources by the process of denudation. The eroded materials brought by rivers, streams, glaciers or wind are deposited in layers to form Sedimentary rocks. For Example — Limestone, Sandstone.

Igneous rocks are formed by solidification of molten magma that comes out from an active volcano. Hence, it is also known as primary rocks. For Example — Granite, Basalt.