16
Lesson 16 of 84 · Regions
Agriculture of the Midwest
Erosion — wind, water, and ice wearing away rock — shapes landscapes. The Grand Canyon was carved by the Colorado River over millions of years.
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?