Mystery #4Tier 1beaches and erosion
Where do all the countless grains of sand on a beach actually come from?
A single beach can hold more grains of sand than there are stars you could ever hope to count. Each grain is tiny, hard and often beautifully rounded. They did not simply appear, and sand is not made in a factory. So where do all the countless grains of sand on a beach actually come from?
Your guess
Every grain of sand came from somewhere. What do you think it used to be, before it was sand?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.