Multiple choice

How was the world different thousands of years ago?

  1. temperatures were colder

  2. the world's water formed thick sheets of solid ice

  3. the seas were shallower

  4. all of the above

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During the last Ice Age, global temperatures were significantly lower, leading to the formation of massive glaciers that locked up water and lowered sea levels.