The Earth’s ____ is approximately 80% nitrogen, 20% oxygen with a little amount of carbon dioxide and water. When water in the early atmosphere ____ the ocean was formed. Plants carry out ____. ____ from millions of years ago died and were buried under layers of mud. Over time they broke down to form oil. The ____ effect is caused by long wavelength radiation being absorbed in the atmosphere. It makes the planet warm enough for life. Ice caps are melting due to global ____. ____ rain is caused by sulfur dioxide from burning fossil fuels. It makes rivers and lakes more acidic and can damage crops. News articles can be ____. They give opinions rather than facts.

The changing atmosphere

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