South America

4. - all forms in which water falls to Earth from the atmosphere.
7. - ecosystem with large, flat areas of grasses.
8. - mass of ice that moves slowly over land.
10. - having to do with trees.
12. - large plateau in southern South America, stretching from the Andes Mountains to the Atlantic Ocean.
13. - area of tall, mostly evergreen trees and a high amount of rainfall.
15. plain - low, flat land lying next to the ocean.

1. - area of land that receives no more than 25 centimeters (10 inches) of precipitation a year.
2. - a dip or depression in the surface of the land or ocean floor.
3. - natural or artificial line separating two pieces of land.
5. - landmass that forms as tectonic plates interact with each other.
6. - large region that is higher than the surrounding area and relatively flat.
7. - portion of an ocean or sea that penetrates land.
9. - flat, smooth area at a low elevation.
11. - type of tropical grassland with scattered trees.
14. - land permanently saturated with water and sometimes covered with it.