Word within the word - ideas #2

How many things can u think of that are composed of or resemble concentric circles?

What? so my lucky answer is dart board, people eyes, the targart sign, shooting targets, and the surface of a dvd player

Hi Jeremy, here are my answers:

People's eyes, the Target sign, shooting targets, a dart board, some flowers, the formation of a tornado and a hurricane, Stonehenge, the ripples that form when you drop a pebble in a pool of water, the rings of Saturn, tree rings, the surface of a CD, and crop circles.