-: Rocks and Minerals:-

• The earth’s crust is made of various types of rocks. Any natural mass of mineral matter that makes up the earth’s crust is called a rock.

• There are three major types of rocks; igneous rocks, sedimentary rocks, and metamorphic rocks.

• when the molten magma cools, it becomes solid. Rocks thus formed are called igneous or primary rocks. They are of two types, extrusive igneous rocks, and intrusive igneous rocks. primary rocks. They are of two types, extrusive igneous rocks, and intrusive igneous rocks. primary rocks. They are of two types, extrusive igneous rocks, and intrusive igneous rocks.

• Rocks roll down and break into small fragments and these smaller particles are called sediments. These sediments are transported, compressed, and hardened to form layers of rocks. These types of rocks are sediments. These sediments are transported, compressed, and hardened to form layers of rocks. These types of rocks are sediments. These sediments are transported, compressed, and hardened to form layers of rocks. These types of rocks are called sedimentary rocks.

Rocks 

• Igneous and sedimentary rocks can change into metamorphic rocks under great heat and pressure.

• The process of transformation of the rock from one to another is called the rock cycle.

• Rocks are made of different minerals. Minerals are naturally occurring substances that have certain physical properties and definite chemical compositions. have certain physical properties and definite chemical compositions. have certain physical properties and definite chemical compositions.