What is the meaning of congested in this passage? a. crowded c. diseased b. polluted d. dangerous

In 1915 the german geologist and meteorologist alfred wegener first proposed the theory of continental drift, which states that parts of the earth's crust slowly drift atop a liquid core. the fossil record supports and gives credibility to the theories of continental drift and plate tectonics.

The earth's internal process which drives seafloor spreading is

How do oceanographers measure the salinity of ocean water?