A large, slow-moving mass of ice.
glacier
Dangerous waste materials that can harm people or the environment.
toxic waste
Energy that comes from sources that don’t run out, like the sun or wind.
renewable energy
Dirty air caused by smoke, gas, and chemicals.
air pollution
A low area of land between hills or mountains, usually with a river.
valley
A long time with no rain, which makes the land dry.
Drought
A large, dry area of land with very little rain and few plants.
Desert
Energy from sources like coal or oil that will run out one day.
non-renewable energy
A lot of water that covers land that is normally dry.
Flood
Energy sources like coal, oil, and gas that come from the ground and pollute the air.
fossil fuels