Possibly freedom? I'm not sure however
<span>The most appropriate answer is thickness. Earth's atmosphere is thicker than Mar's atmosphere. This could be due to the fact that the earth is more massive amd can hold a thicker atmosphere. The Martian atmosphere is composed mostly of carbon dioxide. The atmosphere is thin and cold so liquid water would evaporate or freeze. </span>
<span>d. the ural and caucasus mountains</span>
The development of large farms has polluted the river through waste runoff.
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