Want worms without paying for them? Try worm grunting!
Have you ever had a mole out in the backyard that spends all day digging tunnels through your lawn? Try to be too mad, it's just looking for food.
In the desert, the absence of water means little or no chemical weathering can take place. Instead, erosion, frost, sedimentation, and the huge temperature fluctuations between day and night break down the rocky surface into sand or gravel.