Q: What do you call a period when temperatures are cooler than normal, causing glaciers to spread?


Read this paragraph and choose the correct option from the provided answers:

Over much of Earth’s past, the climate was warmer than it is today. Picture in your mind dinosaurs roaming the land. They're probably doing it in a pretty warm climate! 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?.

 Choices:

- polar age

- earth age

- thermal age

- ice age


A:
ice age