These rocks are located in a dry desert climate . which type of weathering is the most likely cause of its shape

Wind erosion is the main cause. And since it is the desert that wind can pick up tiny sand rock particles that slowly grind against the rock. Over time the erosion will give a jagged rock the smooth features as if it had been submerged in a river for the roughly same period of time.

Developed countries will see a decrease in natural resources, because their population will decrease.