Riff-Raff Quiz of the week: Nature

How long have humans existed
3 million years
19 thousand years
200 thousand years
18 million years
How many species of animals are there?
8.7 million
907,851
14.9 million
1 billion
What percentage of the earth is covered in water?
99%
71%
48%
80%
How many ice ages have there been?
7
1
3
5
0
How long were dinosaurs on earth?
52 million years
172 million years
1,862 years
5.9 million
Is the earth flat?
Yes
No
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