If you look on a map you will see that there is a desert next to the Rocky Mountains in the United States, and a desert next to the Andes in South America. Wind is also another way deserts form. The wind that blows in the desert comes from far away waters. As it is travels, the moistness leaves. By the time any wind reaches the desert, it is very dry.
Wind also helps in the formation of sand dunes.
Sand dunes are huge piles of sand blown there by strong gusts wind. Some sand dunes may be over 200 meters in height. Canyons are another formation in the desert. Some canyons are called arroyos. Arroyos are formed when it rains.