February 20, 2022
Rock, stone, or pebble?
I’ve been running quite a few primary school rock and fossil classes in Yorkshire this half-term. At Crofton Junior School near Wakefield, one of the girls in the class asked an excellent question: “What’s the difference between a rock, a stone, and a pebble?” I started with the easy bit, which is ‘pebble’ as that’s a particle between 4mm and...