The earth is a very different place because we have a atmosphere. It blocks a lot of bad things. Such as they rays coming from the sun. It makes sure that we have enough and not too much. It also protects us from meteors. Which when they hit our atmosphere it burns up from all the friction from the gas that it is made up of. The ozone is a part of the atmosphere that protects us from the sun. The atmosphere is mostly made up of nitrogen it is 78%. Oxygen is 21% of it and then the other 1% is a mix of other gases. The moon has no atmosphere so there is a lot going on. Any meteor heading its way hits it. It also can very in temperature all the time.