A substance with a definite shape and volume is a solid.

Here's why:

* Definite shape: Solids maintain their shape regardless of their container. The particles within a solid are tightly packed and held together by strong intermolecular forces.

* Definite volume: Solids have a fixed volume that doesn't easily change. The particles in a solid are fixed in specific positions and don't easily move around.

Examples of solids include:

* Ice

* Rock

* Wood

* Metal

* Plastic