"Explains how ozone holes happen, what effects they have on the environment, and what can be done about this problem. Suggested level: primary, intermediate."@en . . "The ozone hole" . "The ozone hole"@en . . . . "Kharq al-ūzūn" . . "Ozone hole"@en . . . . . . "Juvenile works" . "Juvenile works"@en . "Explains how ozone holes happen, what effects they have on the environment, and what can be done about this problem." . . . . . . . . "Pollution." . . . . "Ozone layer." . .