Contents
Key Stage 2
Meaning
The Earth is the third planet form the sun and the home planet of the Human species.
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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
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| 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.
Crust
The Crust is split into several lumps that float on the Mantle. They are called Tectonic Plates. They move around separately and and when the rub against each other this causes Earthquakes. If one Tectonic Plate moves on top of another the Tectonic Plate underneath starts to melt and magma rises up to make Volcanoes.
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| A diagram showing the different Tectonic Plates that make the Earths Crust. |
Composition of the 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.
Earth's Atmosphere
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| A Pie Chart showing the percentage of different gass in the Earth's Atmosphere. |
- The Earth's Atmosphere has not always had the same proportions of gases. 3.9 billion years ago there was no Oxygen in the atmosphere. In the last 200 years humans have caused the Carbon Dioxide in the Earth's Atmosphere to double.