Here's why:

* Color: Color is determined by how a material interacts with light. Different materials absorb and reflect different wavelengths of light, giving them different colors. For example, a red apple reflects red light and absorbs other colors.

* Shape: Shape is simply the external form of an object. Solids can have a wide variety of shapes, from the regular shapes of a cube or sphere to the irregular shapes of a rock or a tree.

Examples:

* A diamond is a solid with a unique crystal structure and can be cut into many different shapes, but it will always have the same color (clear or with a slightly yellow hue).

* A red ball and a blue cube are both solids, but they have different colors and shapes.

* A piece of iron can be shaped into a flat sheet, a long rod, or a complex machine part, all while retaining its metallic grey color.

So, while solids have a fixed volume and shape, their color and shape can vary greatly.