6
Lesson 6 of 84 · U.S. Regions
The Rocky Mountain States
Tropical rainforests near the equator are the most biodiverse ecosystems. The Amazon alone contains about 10 percent of all species on the planet.
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?