1. What is an 'ice age' in geology?

2. How do scientists know about past ice ages?

3. What do we call the period of an ice age where the glaciers are receding?

4. During which of the following ice ages did the Earth become a 'snowball Earth'?

5. Which of the following ice ages is the most recent ice age?

6. Which of the following ice ages was named after an area in South Africa?

7. True or False: An increase in volcanic activity can help bring an end to an ice age.

8. Which cause of an ice age occurs from a lack of greenhouse gases?

9. Which cause of an ice age is sometimes called Milankovitch Cycles?

10. True or False: Most of Canada was covered in ice just 20,000 years ago.