Answer:
<em><u>Weathering & Erosion </u></em>
Explanation:
Weathering & erosion of the Colorado River is the reason the Grand Canyon exists in the first place. (Or Paul Bunyan)
One of the primary consequences of the railroad in the United States was the creation of a system by which goods could easily be moved east to west, opening new sections up that were previously only accessible by horse or on foot.
Answer:
option A socioeconomic is your answer
Explanation:
hope it work!
Brainliest plz
