The martian atmosphere is composed of ~96% co2, but the greenhouse effect is much less than that on earth. (a) explain what the greenhouse effect is on earth and (b) use the value of the solar constant on mars (600 w m) and a typical surface air density on mars (0.02 kg m) to provide two reasons why the greenhouse effect is less on mars than on earth. -2

As explained below.

Explanation:

As the martin air composed of 96% of carbon dioxide and some parts of methane but this greenhouse effect is much less as compared to that of the earth as on earth the greenhouse gases are not as rugged and as profound as they are on the martian surfaces  and hence they are more intact and well produced in mars dry and rocky environment. The more is the greenhouse gas concentration the more is the planets lots of co2 is wrapped in the oceans and ice layers that are trapped into the air keeping the air warm and dry. Having a thin and less dense atmosphere than the earth this planet experiences drastic temperature changes thus the greenhouse effects are less profound on earth. Mars experiences frequent temperature changes and dense storm surges also.