Golf balls roll or are shot into water hazards during rounds of play (small ponds that are scattered throughout a golf course). Golf balls are waterproof, so they will not be damaged if submerged. Golfers may save money by reusing and recycling their clubs rather than purchasing new ones. Recycling is also good for the environment. People love to play games with rules. In golf, those games are called "holes." Holes are where you put the golf balls if you don't want to hit them out of bounds (into the woods or onto the fairway). If you're lucky enough to have someone throw your ball back into the fairway for you then you have an opportunity to make up some ground on your competitors. The farther back you can get your ball relative to the hole, the better your chance of making par on this hole. Getting your ball in one of these holes called "greens" means you'll need some help from nature or not. Greens are where they grow trees for real golf courses but kids don't always know what kind of tree they should leave their ball under. Some popular types of trees found on golf courses include: American elm, black walnut, blue gum eucalyptus, and sycamore. Holes with water hazards are played just like any other hole except that there's a risk of losing points for hitting the ball in the water.