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Grades K–5ScienceLight, Water and WeatherLesson 1 of 3For families · ages 5 to 11

Where do rainbows come from?

Children split sunlight into colours with a glass of water, test whether the water is what makes the rainbow, and make their own rainbow with a hose mist. They finish able to explain that white light is a mix of colours that water bends apart.

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First page of the Where do rainbows come from? teacher guide
Preview · the opening mission

Read this aloud:

After a summer storm, Maya ran to the window. A rainbow stretched across the sky. "Where did it come from?" she asked. "It wasn't there before the rain." Her little brother had a plan: "Let's go and find the end of it." Grandpa smiled: "We can make our own, right here in the kitchen." Your job: find out what a rainbow needs, and make one yourself.

Jobs:

  • One child does everything, with you helping.
  • Two children: the Light keeper (holds the paper and moves it to catch the light) and the Recorder (colours what you see on the sheet).
  • Three children: add a Checker, who makes sure only one thing changes in the fair test.

In the full lesson PDF

  • Bet (5 min)
  • Hunt (20–30 min)
  • Reveal (10 min)
  • Act (10 min)
  • The science, for grown-ups
  • Questions they'll ask (and what to say)
  • Make it easier, make it harder
  • Go further
  • Student sheet

Written for parents: no science background needed. US Letter, prints cleanly in black and white, with a kids’ sheet on its own page.

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