Earth

The Earth is the third planet from the sun and the only known planet to support life. It is a rocky planet with a diverse range of ecosystems, climates, and geological features.

Structure of the Earth

• Crust: The outermost layer of the Earth, made up of solid rock.
• Mantle: The layer beneath the crust, composed of semi-solid rock.
• Core: The innermost part of the Earth, consisting of a solid inner core and a liquid outer core.

Geological Features

The Earth's surface is shaped by a variety of geological processes, including:

• Volcanoes: Formed by the eruption of molten rock from beneath the Earth's surface.
• Mountains: Created by the collision of tectonic plates or volcanic activity.
• Oceans: Large bodies of saltwater covering approximately 71% of the Earth's surface.
• Rivers and Lakes: Formed by the erosion and deposition of water over time.

Atmosphere

The Earth is surrounded by a thin layer of gases, known as the atmosphere, which plays a crucial role in supporting life. The atmosphere is composed of nitrogen, oxygen, carbon dioxide, and other trace gases.

Study Guide

Here are some key concepts to study about the Earth:

1. What are the layers of the Earth?
2. How do geological features such as mountains and volcanoes form?
3. What role does the atmosphere play in supporting life on Earth?
4. What are some of the different ecosystems found on Earth?
5. How does the Earth's position in the solar system contribute to its ability to support life?

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