Earth

The Earth is the third planet from the Sun and the only known planet to support life. It has a diverse range of ecosystems, including deserts, forests, oceans, and polar regions. The Earth is also unique in its abundance of water, which exists in liquid form on its surface. Understanding the Earth is essential to understanding the environment and the impact of human activities on the planet.

Layers of the Earth

The Earth is composed of several layers. The outermost layer is the crust, followed by the mantle and the core. The crust is divided into large tectonic plates that float on the semi-liquid mantle. The core is divided into the outer core, which is molten, and the inner core, which is solid due to high pressure.

Atmosphere

The Earth's atmosphere is a layer of gases that surround the planet. It is composed primarily of nitrogen and oxygen, with trace amounts of other gases. The atmosphere plays a crucial role in regulating the planet's temperature and protecting it from harmful solar radiation.

Study Guide

1. What are the three main layers of the Earth?
2. How does the Earth's atmosphere support life?
3. What are some of the different ecosystems found on Earth?
4. How do tectonic plates contribute to the Earth's geology?
5. What is the role of the Earth's magnetic field?

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