Here's why:

* Speed vs. Movement: When we talk about "moving faster", we're usually thinking about the speed of individual molecules. But the movement of a liquid or solid is about the collective motion of many molecules.

* Molecular Arrangement: In a solid, molecules are tightly packed and held in a fixed, rigid structure. They can only vibrate in place. In a liquid, molecules are more loosely packed and can move around each other, but they're still close together.

* Flow: Liquids can flow because their molecules can move past each other. This ability to flow makes it seem like liquids move faster, but it's really just a change in their arrangement.

* Temperature: The speed of individual molecules *does* increase with temperature. So a hot liquid will have faster-moving molecules than a cold solid, but that doesn't mean the liquid is moving faster as a whole.

Example: Imagine a crowded room. People in the room (molecules) can move around, but they're limited by the space. Now imagine a wide open field. People can move around much more freely. The people in the field are like the molecules in a liquid, but they're not necessarily moving *faster* than those in the crowded room.

In summary: Liquids can flow and change shape because their molecules have more freedom to move around each other, but the speed of individual molecules is more dependent on temperature.