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Which of the following BEST describes the composition of the Earth's atmosphere?
The atmosphere is a thin layer of gases that surround the Earth which absorbs radiation and moderates climate.
The atmosphere is made up of mostly Oxygen and Hydrogen.
The concentration of atmospheric gases is not affected by human activity.
The atmosphere is composed of three layers which are known as the stratosphere, troposphere and mesosphere.
The pressure and temperature stay constant throughout the atmosphere.