Compare the current atmospheres of earth, venus, and mars in terms of composition, thickness (and pressure at the surface), and the greenhouse effect.

Explanation:

The atmosphere of Earth is about 1/5 part oxygen and 4/5 part of nitrogen ,

The atmosphere of Venus is mostly of carbon dioxide  and have pressure of about 90 times higher than Earth ,  

The atmosphere of Mars is also mostly of carbon dioxide and have pressure one hundredth that of the Earth .

Due to high concentration of carbon dioxide , Venus , shows greenhouse effect , and thereby leading to high surface temperature .

Mars has a runaway refrigerator effect , and thereby having thinner atmosphere and colder temperature .

Earth is also overcoming with the problem of green house effect , due to increased carbon dioxide in the atmosphere .