Mystery #3Tier 2magnetism
How does a compass always find north?
Spin a compass round and round, set it down anywhere on Earth, a forest, a boat, the middle of a desert, and its little needle swings about, then settles, pointing the same way every time: north. Nobody set it. There's no signal, no battery. How does a sliver of metal know which way north is, all on its own?
Your guess
What do you think the needle is responding to that makes it always swing to north?
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.