Multiple choice

White sand beaches are made from

  1. Erosion of igneous rock

  2. Parrot fish poop

  3. Rich people who grind up diamonds and shower in them

  4. Solidification of magma
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Many tropical white sand beaches are composed of calcium carbonate, much of which is excreted by parrotfish. Parrotfish graze on algae growing on coral reefs, grinding up the coral skeleton in the process and excreting it as fine white sand.

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