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2a²-a²
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The atmosphere is the layer of gases around the Earth. It is held in place by Earth's gravity. ... It also has plentiful oxygen (20.9%) and small amounts of argon (0.9%), carbon dioxide (~ 0.035%), water vapor, and other gases. The atmosphere protects life on Earth by absorbing (taking) ultraviolet rays from the sun.
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2a^2 - a^2 = a^2
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