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Hydrology and Hydraulic Engineering: The hydrologic cycle and precipitation · The Hydrologic Cycle and Water Budget

How water moves between oceans, air, land and aquifers, and how a catchment's water budget balances precipitation, evapotranspiration, runoff and storage.

Hydrology and Hydraulic Engineering · 25 questions

Try 3 questions

1. Where is most of Earth's freshwater stored?

  1. In lakes and rivers
  2. In glaciers and ice caps
  3. In underground aquifers
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Answer: In glaciers and ice caps

Ice sheets and glaciers, mostly in Antarctica and Greenland, hold roughly two thirds of all freshwater; aquifers come second.

2. What is the main source of the water vapor in Earth's atmosphere?

  1. Evaporation from the oceans
  2. Transpiration from forests
  3. Evaporation from lakes and rivers
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Answer: Evaporation from the oceans

Oceans cover about 70% of the planet and supply roughly 85% of all evaporation, far more than land surfaces and plants combined.

3. What supplies the energy that drives the hydrologic cycle?

  1. The Moon's tidal pull
  2. Radiation from the Sun
  3. Heat from Earth's interior
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Answer: Radiation from the Sun

Solar energy evaporates water and drives the winds that carry vapor; gravity then brings it back down as precipitation and runoff.

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