As far as scientists can tell, Earth is the only planet in the solar system to have water, in liquid form, on its surface.
Earth is also the only planet that is able to support life. This is largely due to its mild, steady temperature and thick, oxygen-rich atmosphere.
The Earth is the largest and densest of the four rocky planets.
Water covers three-fourths of the Earth's surface! Ice covers more than one-tenth!
The surface of the Earth is constantly changing. Great big pieces, or plates, of solid rock are floating on top of molten rock. As they drift, they sometimes bump up against each other. Over thousands of years, a mountain range can form!
Signs of life, such as seasonal changes in plant color, radio signals, and man-made lights, can be observed from space!
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