81
Lesson 81 of 84 · U.S. Regions
State Parks and Landmarks
The Arctic is mostly frozen ocean; Antarctica is a continent covered by ice up to three miles thick. Both polar regions are affected by climate change.
Key Facts
1
Earth has seven continents.
2
There are five major oceans.
3
Climate differs from weather.
Check Your Understanding
Question 1
1 of 2How many continents are there?