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1. The hole in the ozone layer in Antarctica was 13 times bigger in 1991 than in 1981. If the hole in the ozone was 15 square feeet in 1981, what was its size in 1991?
Check your
answer!
2. Plastic garbage kills 1 million birds and 100,000 marine mammals each year.
At that rate how many birds will be killed in a decade? How many marine mammals?
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answer!
3. Humans destroy 115 square miles of tropical rainforest daily.
How many square miles of tropical rain forest are destroyed in a week?
Check your
answer!
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