When rocks are heated up or put under a lot of pressure, they can change drastically. This is because the minerals that make up the rocks form only at certain temperatures and pressures. Graphite and diamond are two minerals that are both made entirely out of carbon. ...
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As earth consists of the 78% of the nitrogen that is an essential greenhouse gas acts as a layer that of the mars is about the 2.5% while that of the other gases planet has most of the carbon content and has hydrogen and helium gases. This also will depend on the composition of the planet and its impact by the comets and other objects in the outer space.
