The landforms on the east and western part of the continent are very different, with the main reason being that the western part is geologically very active, while the eastern lacks geological activity.
Explanation:
The eastern part of the United States and Canada, or rather the eastern part of the North American continent, is a region that lacks geological activity for millions of years. This region can roughly be divided into two parts, one being dominated by the Appalachian Mountain Range, and the other being the plains. The Appalachians are medium high mountains, being heavily eroded, with smaller slopes, and covered with dense forests. The plains stretch along the coastline, but they are also very wide, and move several hundred of km into the mainland, making big portion of this region flat lowlands.
The western part, on the other hand, is geologically very active. There are several young mountain ranges which are still growing. There is volcanic activity, faults, and plateaus between the mountains. The coastal plains are very small and narrow. Because of the shadow effect, between the mountains there are arid zones where deserts and steppes dominate.
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The answer is D. photosynthesis
Photosynthesis is not considered as a process of the water cycle.
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