earths atmosphere

The Earth, unlike Mercury, has an atmosphere. the Earth's atmosphere is 78% nitrogen, 21% oxygen, and 1% of other substances. since mercury has no atmosphere, there is no weather. also at night it is freezing cold since there isn't an atmosphere to trap the heat, when it is day time on mercury it is blazing hot since it doesn't have the atmosphere to protect it from letting to much heat onto the planet. If you were to walk on mercury, your footprint would be there forever since there would be no wind or rain to wash it away. The atmosphere is what cause earth to have weather. if you were to walk on the ground on earth, then by a few days it would all go away. that is how earth is different from mercury