Which sentence best describes mass movement? a. the downhill movement of animals due to heavy snow in their normal home
b. the steady pace of air bouncing off a mountain
c. the movement of particles within an atom
d. the downhill flow of soil and rock resulting from gravity

Short answer/constructed response: respond to the question in 3-5 complete sentences. give details or examples to support your answer. attempt to answer all parts of the question in paragraph form! using the source 1 map, pick two of the 1800's territorial acquisitions you believe were the most important in the development of the united states. provide at least two reasons per territory to explain why you think they were the most important.