1) There is ___ in our atmosphere, and it's necessary for us to breathe. a) oxygen b) carbon dioxide c) nitrogen 2) If Earth was closer to the Sun, it would be... a) colder b) hotter 3) If Earth was more distant from the Sun, it would be... a) colder b) hotter 4) If our planet was much hotter, the water would... a) freeze (become ice) b) evaporate (become gas) c) be liquid 5) If our planet was much colder, the water would... a) freeze (become ice) b) evaporate (become gas) c) be liquid 6) If our planet didn't have an atmosphere, the temperature would be... a) very different during the day and the night. b) the same during the day and the night. 7) The atmosphere protects our planet against... a) gravity b) solar radiation

Life on Earth

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