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The water cycle

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  • Where does precipitation collect after falling to Earth?
    Rivers, lakes, and oceans
  • What is the continuous movement of water on Earth called?
    Water cycle
  • Why is the water cycle called a “cycle”?
    Because it repeats continuously without ending.
  • What is the main source of energy for the water cycle?
    The sun
  • What is it called when plants release water vapor into the air?
    Transpiration
  • What word describes water that flows over the surface into rivers and lakes?
    Surface runoff or streamflow
  • What is it called when water falls from clouds as rain, snow, or hail?
    Precipitation
  • What is it called when water changes from a liquid to a gas?
    Evaporation
  • Why do we say we are using the same water as the ancient Greeks?
    Because water is recycled through the water cycle.
  • What forms when water vapor cools and turns into tiny droplets?
    Condensation
  • What happens to water vapor when it cools down high in the atmosphere?
    It condenses into water droplets forming clouds
  • What is the process that forms clouds?
    Condensation
  • What part of the water cycle happens when clouds release rain?
    Precipitation
  • Why does evaporation happen?
    Because the Sun heats water, giving it energy to change into vapor
  • What causes clouds to move across the sky?
    Air currents in the atmosphere.
  • How does the Sun drive the water cycle?
    It provides heat energy that causes evaporation.
  • What type of precipitation falls when the temperature is below freezing?
    Snow or hail
  • What would happen if there were no condensation?
    Clouds would not form, and it wouldn’t rain.
  • What happens when the air cannot hold any more water droplets?
    The water falls as precipitation (rainfall)
  • How do plants help in the water cycle?
    They release water vapor through transpiration.
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