Hey, Mom! While you're driving down the highway in your that trucker's highjacked Kenworth, ponder this:

Imagine you have a good-sized child's sandbox filled with damp, unpacked beach sand. Now, imagine you were to gently place a bowling ball onto that sand. It would make a shallow depression, right? Then, imagine you were to lift that bowling ball an inch or so and drop it onto the sand. It would make a slightly deeper depression, right? Now, imagine you were to climb a step-ladder, lift that bowling ball over your head, and throw it onto the sand. It would make a hole, wouldn't it? So, at what point does the change from depression to hole occur?