<span>Erosion by rivers is a main valley-forming
process; other processes, such as movement of the earth's crust and
glaciers, also have an important part in some cases. The rate at which a
river deepens its valley depends on several factors.</span>
The sequence of events that can lead to magma becoming soil is C. crystallization followed by exposure and weathering. Under these circumstances it may happen that magma actually turns to soil - it cools off so much that it becomes the ground we walk upon.
The geography of East Asia is described as mountainous. An example is the geography of west and north China. It is usually dominated with mountains, steppe lands, plateaus, and deserts. I hope my answer has come to your help. God bless and have a nice day ahead!
The tropics get more rainfall than on the other places on earth because more evaporation takes place in the tropics.
