How do wetlands form?

tributaries flow into rivers

runoff travels down the side of a divide

water builds up in a depression left by an ice sheet

groundwater comes to the surface and floods the land

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Wetlands are formed when the groundwater comes to the surface and floods the land.

Explanation:

The areas adjacent to large water bodies like seas and rivers are often flooded by the water from these water bodies. Before the water from these areas percolates down or evaporates, they are again flooded by more water.This repetitive action of flooding keeps the land under water for long periods and eventually turns them into wetlands.

Since wxyz is 4, halfof that would be 2.