Earth
EARTH
Earth is the planet we live on. Earth is a huge sphere, or ball, that goes around the sun in a circle. It is covered with water, rock, and soil and surrounded by air. Animals and plants live almost everywhere on Earth's surface. They can live on Earth because it is just the right distance from the sun. Living things need the sun's warmth and light. But if Earth were closer to the sun, it would be too hot for living things. If Earth were farther from the sun, it would be too cold for anything to live. Also, Earth has plenty of water. Most living things need water.
Earth is one of the nine planets that travel through space around the sun, and it is always moving. It spins like a top, and at the same time it travels around the sun. Human beings use these movements to measure the length of days and years on Earth. One day is the time it takes Earth to spin around once. One year is the time it takes Earth to travel once around the sun. Earth is not perfectly round. It is a......
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