What causes the Aura Borealis or the Northern Lights on Earth?
1. The Sun's Gravity
2.The Sun's Light
3.The Sun's Heat
4.The Sun's Magnetic Field

Match the pollutants. 1. a chlorofluorocarbon smoke 2. a biodegradable organophosphate insecticide freon 3. particle pollution paint 4. hazardous waste monoxide 5. carbon is completely burned malathion 6. carbon is incompletely burned dioxide

In which layer do organisms on earth love?

9. the history of life on earth is recorded in