The word "Terra" in Italian means "earth". And the heap (or terrigenic) is a mound, usually conical in shape. These piles can be found where there is mining. Valuable ore or coal is exported for further processing, and waste rock remains. It forms the piles.
Day and night out of the earth trolley with useless breed. And grow on the surface of the artificial mountain. Loose sand of them rise with the wind, the rain wash away from the piles of salt and other soluble substances. So the former underground breed litters the planet.