1. A Sigma Science Presentation
3D Rocks and Soils
Looking at Rocks

2. Finding and Using Rocks
What do you think is beneath all the land and oceans on the planet Earth?
The Earth is a SPHERE. If you could cut this sphere in half you would see the four layers that make up the planet Earth.
The Mantle
The mantle is the rocky layer located under the crust. The rock in this layer is quite thick and can be very hot.
The Crust
The crust is the thin outer layer of the Earth. This is the layer we walk on. It is made from a thin layer of cool rocks.
The Inner Core
The core is the iron-nickel centre of the Earth. It is very hot and under great pressure.
The Outer Core
The outer core layer is made from molten metals and rock. It is so hot that it is a liquid.

3. Using Rocks The rocks we use are gathered or made in a number of ways:
Collected from the Earth's surface
Dug up and quarried using special digging machines and tools
Made from materials such as clay in brick-making factories

4. Rocks can be either natural (part of the Earth), or manufactured (made in factories).
Look at the rocks below and say whether you think the rocks are natural or manufactured:
Granite Pebbles
Slate Roof
Sandstone Wall
Breezeblocks
Chalk
Concrete Bollard
Brick Wall
Concrete Lamp Post
Precious Stones
Clay Chimney Pots

5. Rocks can be used for a variety of purposes
What are the rocks being used for in the images below?
Housing
Gravestones
Monument
Steps
Statue
Walls
Roads
Paving