|Maria Gonzales is a 12-year-old soccer player living in Punta Arenas, Chile, which is the one of the southernmost cities in the world. In spring, which occurs the same time as the Northern Hemisphere's autumn, her team is not allowed to practice outside at lunchtime.
Because sometimes, at that time of year, the amount of ultraviolet radiation in southern Chile is so great that people get badly sunburned in as little as 7 minutes.
The intense sunlight also causes skin cancer, cataracts, and other medical problems.
It wasn't always this way. Kids used to be able to play outside before scientists discovered that a hole had grown in our planet's protective shield of ozone.
In this lesson, you'll use satellite images like the one to the left and a program called WebImage to find the answer to the question,
"What happened to Earth's sunscreen?"
|© Center for Image Processing