Chemical weathering
a. is caused by freezing and thawing
b. breaks apart rocks by physical processes
c. occurs when chemical reactions dissolve or change the minerals in rocks
d. none of above

How much of the united states’ electric generation comes from coal? a. about 25% b. about 50% c. about 75% d. about 90%

Topographic maps are used to measure a-composition b-movement c-elevation d-texture

What is the difference between the cultures of central asia and the caucasus region? the majority of people in central asia are muslim; the majority in the caucasus region are christian. the primary language in central asia is armenian; the primary language in the caucasus region is russian. central asia has been plagued by ethnic unrest; the caucasus region has had little ethnic conflict. the effects of soviet rule can still be seen in central asia; the caucasus region has developed its own identity since the fall of the ussr.