Question

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Explanation:

1. "wetland areas constantly filled with water" - Wetlands are areas that are often water - logged, so this matches Wetlands.
2. "subterranean layer of rock permeable to water" - An aquifer is a underground layer of rock that can hold and transmit water, so this matches Aquifer.
3. "mass or river of ice formed by compressed snow and ice" - A glacier is a large mass or moving river of ice formed from compressed snow and ice, so this matches Glacier.
4. "habitat in which shallow pools of water form where there is poor drainage in the land" - Marshes are a type of wetland with shallow water and poor drainage, so this matches Marshes.

Answer:

1. wetland areas constantly filled with water - Wetlands
2. subterranean layer of rock permeable to water - Aquifer
3. mass or river of ice formed by compressed snow and ice - Glacier
4. habitat in which shallow pools of water form where there is poor drainage in the land - Marshes