Answer:
26- Zone of aeration- Soil and rock that both contain water
27- Groundwater- Water held underground
28- Zone of saturation- Saturated with water
29- Sinkhole- Hole in the ground caused by erosion
30- Sediment- Material that is broken down by weathering or erosion
31- Floodplain- Low-laying ground next to the river or water area
32- Caverns- A large cave or chamber