Answer the following question given this paragraph: 

But ice ages also occurred many times in the past. An ice age is a period when temperatures are cooler than normal. This causes glaciers to spread to lower latitudes. Scientists think that ice ages occurred at least six times over the last billion years alone. How do scientists learn about Earth’s past climates?.


Q: What is the term for a period when temperatures are cooler than normal causing glaciers to spread to lower latitudes?

 Choices:

- cooling era

- cold age

- freezing point

- ice age

A:
ice age
