Match these terms.
1. deeply frozen Earth
2. ocean regions near the equator
3. the point above which trees do not grow
4. a rain forest area of small trees
5. a vast, semiarid area
6. its center is a large desert area
7. a large desert area in Asia
8. wet winter, dry summers
a. tree line
b. Gobi
c. permafrost
d. Australia
e. Mediterranean climate
f. jungle
g. doldrums
h. steppes