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📘 How does the water cycle move a raindrop?

You watch a raindrop strike a leaf. In seconds it may run to a stream—or take a much longer route through soil, ice, or groundwater. The water cycle is a network of pools and transfers, not one fixed loop.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. A raindrop is always travellingDescribe water as moving among storage pools through connected fluxes.The water cycle is continual exchange among ocean, atmosphere, land, ice, living things, and underground stores.
  2. Evaporation loads the atmosphereExplain how evaporation and transpiration add water vapor.Surface water and plants supply atmospheric moisture; wind and humidity affect transfer rates.
  3. Clouds transport and return waterExplain how cooling, condensation, wind, and particle growth transport water and produce precipitation.Clouds are temporary reservoirs whose particles change while winds move moisture across regions.
  4. Land routes set the waiting timeCompare runoff, infiltration, groundwater flow, river transport, and residence times.Pathways range from fast surface runoff to slow underground storage, giving water different waiting times.

Questions this course answers

Put this route in order.

Energy, transport, cooling, and gravity connect the stages.

What is transpiration?

Plants release vapor through leaf stomata.

Match each process to its role.

These processes transfer water among pools.

Why is a cloud not a fixed bag of rain?

Cloud particles exchange water with vapor and moving air.

What is infiltration?

Infiltration sends surface water into the ground.

Put a groundwater route in order.

Water enters, moves downward, stores, and emerges.

Grounded in trusted sources

  • U.S. Geological Survey, The Water Cycle, https://www.usgs.gov/special-topics/water-science-school/water-cycle
  • U.S. Geological Survey, Evaporation and the Water Cycle, https://www.usgs.gov/water-science-school/science/evaporation-and-water-cycle
  • U.S. Geological Survey, Evapotranspiration and the Water Cycle, https://www.usgs.gov/water-science-school/science/evapotranspiration-and-water-cycle
  • U.S. Geological Survey, Groundwater Flow and the Water Cycle, https://www.usgs.gov/special-topic/water-science-school/science/groundwater-discharge-and-water-cycle
  • NASA Global Precipitation Measurement, Hydrologic Cycle, https://gpm.nasa.gov/education/water-cycle/hydrologic-cycle
  • NASA Earth Observatory, The Water Cycle, https://science.nasa.gov/earth/earth-observatory/the-water-cycle/
  • NOAA Northwest River Forecast Center, Water Cycle, https://www.nwrfc.noaa.gov/info/water_cycle/hydrology.html
  • Wikimedia Commons MediaWiki API, image metadata and thumbnails, https://commons.wikimedia.org/w/api.php

Every Wunder lesson is built from real, reputable sources — never invented.

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