The Martian surface is scarred by impact craters, evidence of the same violent bombardments that marred the surfaces of the other rocky worlds. Rocky debris litters the Martian landscape. Some of the canyons on Mars are much deeper than Earth's Grand Canyon. They were carved out by huge rivers that once flowed across the Martian landscape. Now, the rivers are gone.
Any remaining water is frozen.
The atmosphere is so thin and the temperatures so cold that water cannot exist as a liquid. It quickly evaporates. Water is locked in the polar ice caps and in a layer of permafrost beneath the Martian surface. Moisture is locked in the soil itself. If you scoop up a handful of the rocky soil, you can see tiny droplets of water quickly evaporating in the thin air.