earth, in geology and astronomy: The Astronomical Earth

Of the planets, only Mercury and Venus are nearer to the sun; the mean distance from the earth to the sun is c.93 million mi (150 million km).

Sections in this article:

• Introduction
• The Origin of the Earth
• The Change in Seasons
• Rotation and Revolution
• The Astronomical Earth
• The Earth's Core
• The Earth's Mantle
• The Earth's Crust and the Moho
• The Geologic Earth
• Bibliography

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