| http://www.w3.org/ns/prov#value | - atmosphere is permanent gasses and variable gasses is that permanent gasses exhibit a constant proportion from the earth's surface to higher reaches of the atmosphere ??? ??? ??? Carbon dioxide is an important variable gas because all of the above ??? ??? ??? Ozone is found primarily in the ________ and is important because of ________ stratosphere; its interaction with ultraviolet radiation ??
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