1. the earliest atmosphere is thought to have contained mainly....
- carbon dioxide
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Other questions in this quiz
2. The earth was a molten ball of....
- rock and water
- rock and minerals
- lava and rock
3. what brought water to Earth?
- concentrated water vapour and comets
- rain just fell
4. the earliest atmosphere was formed by....
- global warming
- volcano activity
- animals breathing
- plants decaying
5. over 500 million years ago the earth was covered in
- lava and molten rock