How to Eat Rocks.

Imagine you’re stuck on a desert island with nothing to eat and the only things around you are small boulders. If you don’t want to die of starvation then you need this handy guide on ‘How to Eat Rocks’. Don’t forget;

Igneous – do NOT chew

Metamorphic – do NOT chew

Sedimentary – use your best judgement

(thanks Angus)