Ok kids, here’sa beach ball and a Frisbee, a pail and a shovel. I want to see an impressive sandcastle by the time we leave. Don’t stray too far. Wait! Leave your sandals here or put on your wet shoes.
So this summer, while you're building sandcastles at the beach, you can thank your heroic great, great, great grandparents for skipping school so much, they literally had to give us the whole summer off.
So that's saying that a layer of rock that lies on top of another one is younger, right, because we imagine that things are deposited in order, right, as you would make a sandcastle at the beach.