Looking at this picture, which of the following statements is true?
1. It is a good thing to have ozone in the troposphere
2. The tallest mountain on earth reaches the baase of the mesosphere
3. The air is colder at 7 miles above sea level than at 30 miles above sea level
4. Most UV-C light makes it to the earth's surface
5. UV-A is more harmful to humans than UV-B