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No one knows.  It is the only planet not named after a Greek or Roman God.

Earth is the only planet in our Solar System that is known to support life.

Eratosthenes (276-194 BC), a Greek scholar, was the person to determine the circumference of the Earth

Earth's atmosphere is a thin layer of gases that surrounds the Earth.  It is composed of 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide and trace amounts of other gases.

The temperature on Earth ranges from -127 degrees Fahrenheit to 136 degrees Fahrenheit.  The coldest recorded temperature was on the continent of Antarctica.  The hottest recorded temperature was on the continent of Africa.

Earth is the 3rd planet from the sun.

The Earth is blue which is water, its brown because of the land and white because of the clouds in the sky.

Earth is about 7,926 miles in diameter.

Each day on Earth takes 23.93 hours to rotate its axis once.  It takes the Earth 365.26 days to orbit the sun once.

Earth has one moon.

Earth has no rings.

To escape the Earth's gravitational pull, an object must reach a velocity of 24,840 miles per hour.