There are three main types of rocks: igneous, metamorphic, and sedimentary. Igneous rocks form when magma cools and hardens either below or above the surface of the Earth. Metamorphic rocks are formed from existing rocks that undergo changes due to heat and pressure in the Earth's interior. Sedimentary rocks form through the compaction and cementation of sediments such as rocks and mineral particles, skeletons, or other materials over time, usually at the bottoms of lakes and oceans.

1. Science
Rocks and Minerals

2. Types of Rocks
• There are 3 types of rocks:
1.Igneous
2.Metamorphic
3.Sedimentary

3. Igneous Rocks
• Igneous rocks are formed when magma
reaches the earth’s surface; cools and
hardens.
• Examples of igneous rocks are granite
and basalt

4. Granite

5. Basalt

6. Metamorphic rock
• Inside of the earth is like an oven. Heat
inside the Earth ‘bakes’ rocks and
changes the minerals in them.
• These changed rocks are called
metamorphic rocks.
• An example of a metamorphic rock is
marble.

7. Marble

8. Sedimentary rock
• Sediments are rocks and minerals
particles that settles in a liquid
• Sedimentary rocks are made up of
layers of sediments, small pieces of
rocks, or the skeletons of tiny creatures
• Sedimentary rocks are formed by
sediments that are deposited over a
period of time, usually at the bottom of
lakes and ocean.

9. • An example of sedimentary rocks are
chalk and limestones.

10. Chalk

11. Limestone