The ancient mayans used the sinkholes in the yucatán peninsula as

a irrigation canals

b wells

c storage

d earthquake shelters

What role did the waterways of europe play in development of europe's economy

How does central place theory explain patterns in the size and distribution of cities?

If a volcano’s magma is high in silica, the volcano will probably a. erupt quietly. b. remain dormant. c. erupt explosively. d. produce dark-colored lava.