A piece of sod has grass on the top and soil on the bottom.

VOA: special.2009.07.07

Real school choice, with real grass-roots, bottom-up reform means that a community of people who care about their public goods deeply want to work to make those goods better.

FORBES: School Choice and the Value of Public Goods

The bottom is mainly brilliant white sand or greenish grass, but we were searching for the vaguely brown and yellow hues that indicate the rocks and coral where Caribbean spiny lobster (commonly referred to as "bugs" for their insect-like appearance) live.

BBC: Lobster diving in the Abacos