What is the significance of atmosphere for the Earth?

Following are the importance of atmosphere for the Earth:

1. It maintains the temperature of the Earth by trapping the heat, due to presence of Carbon dioxide.
2. It provides us important gases like Oxygen (needed for respiration), Nitrogen (cell formation) and Carbon dioxide (keeps the earth warm).
3. It absorbs ultraviolet solar radiation due to presence of Ozone layer.
4. All the weather phenomena occurs in atmosphere.
5. It is responsible for cloud formation and precipitation which is necessary for water cycle.
6. The Earth is protected by falling meteors as they burn to ash due to friction in atmosphere.