Evaporation & the Water Cycle · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.
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Evaporation and the Water Cycle

Science · Matter & Materials · ages 8-9
Name ______________________   Date ____________

  1. Which word means water vapor changing back into liquid water?

    • Condensation
    • Water freezing
    • Ice melting

  2. Which word means liquid water changing into water vapor at its surface?

    • Condensation
    • Evaporation
    • Freezing

  3. Water can evaporate from a puddle without boiling.

    Circle one:   True   False

  4. In this example, matching bowls each started with 10 mL of water. Only water temperature differed. After an hour, the cool bowl had 8 mL left and the warm bowl 3 mL. Why did more water evaporate from the warm bowl?

    Cool (mL)8Warm (mL)3
    • Warming turns the missing water into solid ice.
    • Warming helps more water particles escape.
    • Warming destroys the particles in the water.

  5. Rain collects in a pond. Later, some pond water evaporates. What does this show about the water cycle?

    • Rain ends the cycle, so this water must be new.
    • Pond water can evaporate only while it is boiling.
    • Water can return to the air after rain.

  6. Start with liquid water in a lake. It becomes vapor, then liquid cloud droplets, then falls as rain. Which names match these three stages in order?

    • Evaporation, condensation, precipitation
    • Evaporation, precipitation, condensation
    • Condensation, evaporation, precipitation

  7. Monday is 15°C and Tuesday is 30°C. Matching towels start equally wet and have the same wind, sunlight and air dampness. Their water is warmer on Tuesday. On which day would you expect faster drying?

    • Monday, because cooling makes more water escape.
    • Tuesday, because warmth speeds evaporation.
    • Both days, because drying does not depend on heat.

  8. Ben calls the droplets forming on a cool bathroom mirror evaporation. Which change is taking place?

    • Liquid drops warm and escape into the air.
    • Water in the mirror melts into liquid drops.
    • Vapor cools and becomes liquid drops.
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Answer key

For grown-ups. Fold this page away before handing over the rest.

Evaporation and the Water Cycle W1-mt_Qkewo5M3_c-s1

  1. Condensation · Condensation changes gaseous water vapor into liquid water.
  2. Evaporation · Evaporation changes liquid water at its surface into water vapor, an invisible gas.
  3. True · Evaporation happens at the surface and can occur even on a cool day. The water does not need to boil.
  4. Warming helps more water particles escape. · Warming gives water particles more energy to escape from the surface as vapor. Less liquid remains because more has evaporated.
  5. Water can return to the air after rain. · Rainwater collects on Earth and can evaporate back into the air. Rain does not end the water cycle.
  6. Evaporation, condensation, precipitation · Lake water becomes vapor by evaporation. Vapor makes liquid droplets by condensation. Rain falling is precipitation.
  7. Tuesday, because warmth speeds evaporation. · The other drying conditions match, and the towel water is warmer on Tuesday. Warmer water evaporates faster, so Tuesday is the expected answer.
  8. Vapor cools and becomes liquid drops. · Water vapor in the bathroom air condenses into liquid drops at the cool mirror. Evaporation changes liquid water into gas.
Worksheet · LightMySky