Highlight the Text In each paragraph highlight key information and
facts that will help you understand and answer the questions.
During the last 2 million years the Earth
has experienced four long periods of cold
climate known as ice ages. During each ice age,
the average temperatures around the world have
dropped dramatically. While the middle latitudes
near the equator stay warm, the higher latitudes
both in the North, and in the South get very cold,
making life in these regions more difficult.