How atmosphere covers the earth ?

Which gas was absent in the atmosphere of primitive earth ?

The moon moves across the sky at approximately 0.5^@ per hour. What you would see,if the moon had an atmosphere like the earth?

What was the effect of oxygen on methane and ammonia found in the reducing atmosphere of primitive earth?

True/False Type Questions: The primtive atmosphere of primitive earth was reducing.

How is our atmosphere different from atmosphere on Venus and Mars ?

Answer the following :- An artificial satellite orbiting the earth in very thin atmosphere loses its energy gradually due to dissipation against atmospheric resistance, however small. Why then does its speed increase progressively as it comes closer and closer to the earth ?

What was the nature of atmosphere in the primitive earth ?