Clouds are not on the Earth's surface. They are formations of water droplets or ice crystals suspended in the atmosphere.

Here's why:

* Formation: Clouds form when warm, moist air rises and cools. As the air cools, the water vapor condenses into tiny droplets or ice crystals, which then gather together to form clouds.

* Altitude: Clouds can occur at various altitudes, from low-lying stratus clouds near the ground to high-altitude cirrus clouds miles above.

* Surface vs. Atmosphere: The Earth's surface is the solid ground, oceans, and other physical features. The atmosphere is the layer of gases that surround the Earth. Clouds exist within the atmosphere, not on the surface.

Let me know if you have any other questions!