Which is a unique feature of mars?
a.
the thick atmosphere—made mostly of carbon dioxide—absorbs solar radiation, heating up and make the atmosphere very hot
b.
it is the smallest planet and has the shortest period of revolution around the sun.
c.
the planet’s surface is covered with red, iron-oxide dust
d.
it is the only planet with permanent liquid water on its surface.
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Which is a unique feature of mars?
a.
the thick atmosphere—made mostly of carbon dioxi...
a.
the thick atmosphere—made mostly of carbon dioxi...
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