How do wetlands form?

a. tributaries flow into rivers.
b. runoff travels down the side of a divide.
c. water builds up in a depression left by an ice sheet.
d. groundwater comes to the surface and floods the land.

Wetlands form when groundwater flows to the floor and the lands are overloaded.

Option d.

Explanation:

While some wetlands may develop relatively fast, many more have required decades for their creation. Some of the processes that shape or change wetlands are here:

d

Explanation:

answer; in the united states the plains include the great plains of the west and the tail grass prairie to the south of the great lakes extending east to the appalachian plateau