What was pangaea? when did it form and when did it break apart? it was
a) a large ocean basin that opened in the triassic and closed in the paleocene
b) the supercontinent that formed in the late paleozoic and broke apart in mesozoic
c) the huge mountain range formed when africa pushed northward into europe in eocene time
d) a large, precambrian shield area of africa and south america that broke apart early in the proterozoic

This is the number of complete movements of a wave per second.

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.

The unit of resistivity is the: ohm ohm-cm volt coulomb