Curious Questions and Answers About... Saving the Earth

Curious Questions and Answers About... Saving the Earth — page 3
What is air The air is made up of gases and it’s wrapped around Earth like a snug blanket It’s called the atmosphere 21 oxygen 78 nitrogen Humans breathe in oxygen and breathe out carbon dioxide 1 other gases carbon dioxide including A gas called nitrogen makes up most of the atmosphere Which gas makes up the next biggest part of the atmosphere Plants leaves take in carbon dioxide to make food They give off oxygen 6