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Atmosphere
This photograph of the colorful layers of Earth's upper atmosphere was taken from the space shuttle, looking sideways across Earth's atmosphere. Image Credit: NASA
the layer of gases surrounding a planetSentences:
Earth's atmosphere protects life on the planet.
There are five layers that make up Earth's atmosphere.
More Information:
http://scifiles.larc.nasa.gov/text/kids/Problem_Board/problems/light/sim3.html →