Earth

The Earth is the third planet from the Sun and the only astronomical object known to harbor life. It is the densest planet in the Solar System and the largest of the four terrestrial planets.

Structure of the Earth

The Earth is composed of several layers:

1. Crust: The outermost layer, where we live, composed of solid rock.
2. Mantle: The layer beneath the crust, composed of semi-solid rock.
3. Outer core: The layer beneath the mantle, composed of liquid iron and nickel.
4. Inner core: The innermost layer, composed of solid iron and nickel.

Atmosphere

The Earth's atmosphere is a layer of gases that surrounds the planet and is held in place by gravity. It is composed of nitrogen, oxygen, carbon dioxide, and other trace gases. The atmosphere plays a crucial role in supporting life on Earth by providing the air we breathe and regulating the planet's temperature.

Study Guide

1. What is the position of the Earth in the Solar System?
2. Describe the layers of the Earth.
3. What role does the Earth's atmosphere play in supporting life?
4. How does the Earth's structure contribute to its ability to support life?
5. What are some of the characteristics of the Earth that make it unique compared to other planets?

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