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💧 How does the water cycle work?

Sun lifts water, cooling makes clouds, rain returns, and land stores move on different clocks.

lessons

~20 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Water leaves the surfaceExplain evaporation, transpiration, humidity, and latent heat.Sunlight drives evaporation; plants add transpiration; humidity tracks vapor versus capacity; latent heat moves energy with phase changes.
Clouds from cooling airShow how lift, cooling, and nuclei create clouds.Rising air cools; vapor condenses on nuclei; different lift paths make different clouds; fog is a ground-level case.
Precipitation returns waterDescribe how drops grow and fall, and where rain goes next.Growth processes enable fallout; snow and rain depend on temperature profiles; runoff and infiltration split the landing.
Storage on and under landMap watersheds, groundwater, ice, and soil moisture stores.Land storage spans fast rivers, slow aquifers, frozen banks, and soil pores — clocks differ even when the water is the same.
A closed loop on an open planetConnect residence times, climate shifts, and human rerouting.Residence times set the pace; climate changes rates and extremes; dams and cities re-plumb the surface network.

Questions this course answers

What primarily supplies the energy for large-scale evaporation from oceans?

Sunlight provides the energy that lets liquid water molecules escape into vapor at Earth's surface, especially over oceans.

Match each term to its meaning

These four ideas describe how water enters air, how plants contribute, how energy hitchhikes, and how close air is to condensing.

Order the steps that often build a cloud from rising moist air

Lift cools air; cooling drives condensation on nuclei; the suspended particles become the cloud you see.

Why do cloud droplets usually need condensation nuclei instead of forming in perfectly clean air?

Tiny particles give water a surface to condense on, enabling cloud droplets under ordinary atmospheric conditions.

Why can a thick cloud fail to produce rain at the ground?

Precipitation requires growth to sizes that can fall; tiny cloud droplets can remain aloft.

Put land paths for fallen rain in a common sequence of options water may take

Infiltration and percolation connect storms to the slow underground limb that later sustains rivers.

Grounded in trusted sources

USGS Water Science School — water cycle and groundwater educational pages
NOAA National Weather Service and climate education materials on humidity, clouds, and precipitation
NASA Earth Observatory water cycle and atmospheric river explainers
OpenStax Earth Science / Meteorology chapters on atmospheric moisture and the hydrologic cycle

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

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