Keep reading to learn more about Earth's different layers, its atmosphere, and what makes the "blue planet" unique. 5 fast facts about Earth. Earth isn't perfectly round; ...

Earth's innermost layer is called the core. The outside of Earth's core is made from molten nickel and iron that can reach temperatures of 9,000 degrees Fahrenheit (5,000 degrees Celsius).

The fourth layer of Earth's atmosphere is the thermosphere. It begins just above the mesosphere and extends to approximately 372 miles (600 km) high, according to NASA.

The Earth is made up of a total of 7 layers which are- crust, lithosphere (crust and uppermost mantle), asthenosphere (upper mantle directly below the lithosphere), lower mantle, ...

Here are some fun facts about Earth as we celebrate this planet we live on for Earth Day.The Earth’s diameter at the equator is 7,926 miles.

Read about the history and future of Earth’s sun as well as fun facts about the sun’s age, size, temperature, and phenomena like solar flares.