Here's why:

* Sandy or Rocky: Deserts can have both sandy and rocky landscapes, depending on the specific location and geological formation.

* Dry Climate: The defining characteristic of a desert is its extremely low rainfall. This leads to sparse vegetation and a dry, arid environment.

Some examples of desert biomes include:

* The Sahara Desert (North Africa) - Known for its vast, sandy dunes.

* The Atacama Desert (Chile) - One of the driest deserts in the world, with rocky landscapes.

* The Mojave Desert (North America) - Contains both sandy and rocky areas.

* The Gobi Desert (Asia) - Primarily rocky and mountainous.

Let me know if you'd like to explore specific types of deserts in more detail!