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USGS CMG InfoBank: Rainfall

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Comment: 02:05 - 02:43 (00:38)
Source: Annenberg/CPB Resources - Earth Revealed - 19. Running Water I: Rivers, Erosion and Deposition
Keywords: "James Sadd", river, rainfall, water, precipitation, groundwater, "glacial ice", "soil moisture", atmosphere, evaporation, plant, landform

Our transcription: So early speculation about rivers actually addressed the wrong question.
The problem was not where does river water come from, but where does all the excess rainfall go?
Only about one quarter of Earth's annual precipitation flows in rivers.
The rest seeps into ground, becomes groundwater, or stored as glacial ice, or soil moisture, or is returned to the atmosphere by evaporation, and growing plants.
Rivers are among the most common landforms on Earth.
Although they appear to vary a great deal in their behavior and characteristics, careful study has shown that all rivers actually have a great deal in common.

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