Earth (planet)/Related Articles
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Age of the Earth: The Earth is around 4.54 billion years old. [e]
Earth's atmosphere: An envelope of gas that surrounds the Earth and extends from the Earth's surface out thousands of kilometres, becoming increasingly thinner (less dense) with distance but always held in place by Earth's gravitational pull. [e]- Earthquake: Sudden motion or trembling of Earth, which results from shock waves generated by the elastic movement of rock masses deep within the Earth, particularly near boundaries of tectonic plates. [e]
Earth science: The study of the components and processes of the planet Earth. [e]- Friends of the Earth: Add brief definition or description
- Snowball Earth: A hypothesis that proposes the Earth was entirely covered by ice during parts of the Cryogenian period, from 790 to 630 million years ago. [e]
- Near Earth Objects: Add brief definition or description
- Near Earth Orbit: Add brief definition or description
