<u>Answer and Explanation:</u>
The mechanism which is responsible for moving the plates that bring change in the position of the continents is the convection in the asthenosphere.
Henry Hess, a geologist and an American Navy officer in the World War II, discovered that the sea floor and the the Mid Atlantic Ridge is spreading which helped the the scientists in studying and understanding the mechanism of how the plates move.
B cuz they can appear at any time
9000/10=900 people per square mile
Answer:
B. He learned in the hopes of improving his life as a slave,if not total escape from slavery.
