What is a river source?, the place where a river begins, the place where a river ends, the middle of the river, where the river meets the sea, Where is the river mouth located?, at the highest point of the river, at the end of the river, in the mountains, near the source, Difference between groundwater and groundwater flow, Groundwater is water in the rivers, while groundwater flow is water in the oceans, Groundwater is stored underground, groundwater flow is its movement, Groundwater is moving water, groundwater flow is still water, Groundwater and groundwater flow means the same thing, What is a tributary?, A body of water surrounded by land, a small river that flows into a larger river, the start of the river, the end of a river, Define infiltration., flow of water into the river, water evaporating into the air, water entering into the ground from the surface, water flowing over the land surface, Define percolation., water soaking into the ground surface, water going deeper underground, water flowing over land, water evaporating into the air, What is surface runoff?, water moving underground through the soil, water evaporating into the air, water flowing over the land surface into rivers and drains, water soaking into the ground

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