What is the ozone layer?

Which gas is a greenhouse gas?

What happens with insecticides and herbicides that we put on our lawns?

How many times in the history of Earth has the number of species dropped drastically?

What are sudden large declines in biodiversity in the fossil record called?

Where is permafrost located in tundra?

Which of the following items would be an ecosystem within the ocean ecosystem?

Which of the following are part of the ocean's ecosystems?

What is an important freshwater ecosystem with a high biodiversity that is also declining in numbers?

What did scientists believe was the cause of the hole in the ozone layer?

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