You see Grug, us in the sand &ldquo;tribe&rdquo; practice agriculture. That means we cause plants to grow near our &ldquo;caves&rdquo;. We may know when it is cold through our tactile senses, but if our plants start to feel cold, it is already too late for them. Therefore, we use the stars to determine when we should bury the plant seeds and harvest the plants so they thrive and produce the most food. <|endoftext|> why sand tribe make rock from wet dirt and plant hair?