That's a great question! It seems counterintuitive, because clouds are made of water droplets or ice crystals, which have mass and should be affected by gravity. However, the statement that gravitational force doesn't act on clouds is incorrect.

Here's the breakdown:

* Gravity absolutely acts on clouds. The water droplets or ice crystals that make up clouds are pulled down by Earth's gravity.

* Clouds stay aloft due to other forces. The main reason clouds don't fall to the ground immediately is upward air currents. These currents, often caused by heat rising from the ground or other weather patterns, keep the cloud particles suspended. Think of it like a balloon – the air inside pushes upwards, counteracting gravity.

* Cloud formation and stability: The balance between gravity pulling the cloud particles down and the upward air currents holding them up is what determines the shape, size, and stability of a cloud.

So, it's not that gravity doesn't act on clouds, it's that other forces counter it, allowing the clouds to float.