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earths early atmosphere
mostly carbon dioxide with nitrogen and water then increasing due to volcanic activity, plants and algae converted carbon dioxide into oxygen
the greenhouse effect
keeps the earth warm, greenhouse gases absorb long wavelength radiation reflected off the surface
acid rain
sulphur dioxide
potable water
water that has low enough levels of dissolved salts and microbes that is safe to drink, its filtered to remove insoluble particles, then sterilised using chlorine or uv