Contents
Key Stage 2
Meaning
The Earth is the third planet form the sun and the home planet of the Human species.
About The Earth
- The Earth is the only planet known to have living creatures on it.
- The Earth has one moon called The Moon.
- The Earth is just the right distance from The Sun for water to be a liquid.
Key Stage 3
Meaning
The Earth is the third planet form the sun and the home planet of the Human species.
Structure of the Earth
A diagram showing the layers of the Earth. |
- Crust: The top layer of the Earth is called the Crust. It is made of rocks but two thirds is covered in a layer of water.
- Mantle: The layer under the Crust is called the Mantle. It is made of rock that is under such a high pressure that it behaves plastically.
- Outer Core: The Outer Core is a liquid layer below the Mantle.
- Inner Core: Underneath the Outer Core is the Inner Core at the very centre of Earth. It is a solid sphere.
Composition of Earth
The different layers of Earth are made of different materials.
- Crust - The most common chemical elements in the Crust are Oxygen (46.6%), Silicon (27.7%), Aluminum (8.1%), Iron (5.0%), Calcium (3.6%).
- Mantle - The Mantle is mostly made of Silicate rocks.
- Outer Core - The Outer Core is mostly made of liquid Iron and Nickle.
- Inner Core - The Inner Core is mostly made of solid Iron and Nickle.