Question

question 4 (1 point)
ice ages are characterized by:
a about 2.8 million years ago (mya), ice sheets began to form around the equator
b most ice ages consist of a series of warm and cold periods
c at the peak of an ice age, sea levels rise to their highest level
d the earth is one big snowball for the entire time of the ice age

Explanation:

Ice ages are long - term periods of reduction in the temperature of the Earth's surface and atmosphere, characterized by the presence or expansion of continental and polar ice sheets and alpine glaciers. Most ice ages consist of a series of glacial (cold) and inter - glacial (warm) periods. Ice sheets form near the poles, not the equator. At the peak of an ice age, sea levels drop due to water being locked up in ice. The Earth is not a complete snowball throughout an ice age.

Answer:

B. Most ice ages consist of a series of warm and cold periods