Mystery #4Tier 2what makes rock strong
Why is one rock tough enough to build with while another crumbles to dust?
Some rocks are strong enough to build castles and cathedrals that stand for a thousand years. Others crumble to powder if you rub them between your fingers. They are all just rock, so why the huge difference? What makes one rock tough and another so weak?
Your guess
What is your guess? What makes one rock tough and another crumbly?
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.