If all the sand in the desert is hollowed out, what kind of scene will be seen? If all the sand in the desert is hollowed out, what kind of scene will be seen?
How deep is the largest Sahara Desert in the world? What will we see when we hollow out the sand? How deep is the largest Sahara Desert in the world? What will we see when we hollow out the sand?
If all the deserts disappear, what impact will it have on humans? If all the deserts disappear, what impact will it have on humans?