Earth

Earth

Earth
Reading Level

	edHelper's suggested reading level:	grades 3 to 5
	Flesch-Kincaid grade level:	4.04

Vocabulary

	challenging words:		outward, ozone, planet, harmful, rays, axis, layer, interesting, orbit, third, gravity, liquid, beneath, system, surface, fact
	content words:		If Earth

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Earth
By Cindy Grigg

¹     Earth is the third planet outward from the sun in the solar system. It is about 93 million miles away from the sun. It is very different from the other seven planets in our solar system. As far as we know, it is the only planet with air we can breathe. It is the only planet with plants and animals. It is the only planet with liquid water. In fact, Earth's surface is almost three-fourths water. It is not too hot and not too cold. The average temperature is about 59 degrees. It is just right for us to live on.

²     Earth has air we can breathe. Our air is a mixture of gases that surround Earth. It is kept in place by the pull of Earth's gravity. If Earth were a much smaller planet like Mercury, its gravity would be too weak to hold the air around Earth. The air around Earth, including the ozone layer, protects us from harmful rays from the sun.

³     From space, Earth is a very pretty planet. It looks like a blue marble covered with swirling white clouds. Beneath the clouds are brown areas of land and blue oceans. It takes Earth one year or 365 days to orbit around the sun. It takes Earth one day or 24 hours to revolve on its axis. Earth has one moon. If you want to visit a planet with the most interesting features in the solar system, you already live there!

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