1. our solar system was created by the gravitational collapse of the solar nebula.
2. our moon was most likely formed by a collision between earth and a mars-sized planetesimal.
3. the first few hundred million years of the solar system's history were the time of the heavy bombardment, during which earth suffered many large impacts.

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.