7: Maapallolla on jääkausia ja lämpökausia

1. What does the terms mean? Ice age, glaciation, continental ice sheet, mountanous ice, warm perioid
2. When was the latest ice age?
3. Why the temperature decreaced?
4. What the glaciation perioid changed the view?
5. How did the melting perioid changed our landscape?
6. What are the benefits from the ice age today?