I am almost positive that the answer is A. freezing
Answer:
Nationalism and U.S. Expansion
American merchants trading overseas wanted the protection of the U.S. government. b. American merchants were involved in world trade.
Much pollution fills the air because of train s which let off steam that contains chemicals.
Answer:Syncline
Explanation:A syncline is a fold in which the youngest rocks occur in the core of a fold (i.e., closest to the fold axis), whereas the oldest rocks occur in the core of an anticline.
A fold of rock layers that slope upward on both sides of a common low point. Synclines form when rocks are compressed by plate-tectonic forces. They can be as small as the side of a cliff or as large as an entire valley.
Synclines are formed when tectonic plates move toward each other, compressing the crust and forcing it upward.
