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Rain, Rock, and the Salty Sea

Rainwater slowly breaks rock into tiny mineral pieces. Rivers carry these pieces and dissolved salts to the ocean, where they mix into the water and make it salty.

In the picture

  1. Wet rock face: rainwater seeps into cracks and loosens tiny mineral grains.
  2. Tiny mineral grain in the stream: flowing water carries it downhill.
  3. Tiny mineral speck in shallow ocean water: it mixes into seawater near the shore.

Examples

  • Rain wearing down a stone step.
  • A stream carrying tiny minerals toward the sea.

Quiz: Rain, Rock, and the Salty Sea (Age 8)

  1. How does rainwater help make ocean water salty?

    • It freezes into ice that keeps salt until summer.
    • It makes clouds drop salt straight into the sea.
    • Rainwater breaks rock into tiny mineral pieces that rivers carry to the sea.
  2. Where do the dissolved salts in ocean water come from?

    • From fish and seaweed living in the ocean.
    • From tiny mineral pieces washed from rocks on land.
    • From the Moon pulling on the tides.
  3. What happens to tiny mineral pieces after a river carries them to the ocean?

    • They mix into the seawater and help make it salty.
    • They turn into sea animals.
    • They float back up into clouds.

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Nature, Age 8