Be sure you have answered every question. A fluid made of some material is usually more dense than a solid made from the same material. Liquids are much more compressible than solids. Gases and liquids are both classified as fluids. According to Pascal's Principle, the pressure in a fluid is the same everywhere.
Gases have strong intermolecular forces acting, keeping the molecules close together.
The atoms or molecules in a crystal are arranged in an ordered, periodic pattern. The molecules of a crystal are characterized by totally random thermal motion. The molecules in a crystal are rigidly held in place so that they cannot move. Solid and crystal are different terms that describe the same state of matter. Because of strong intermolecular forces, crystals have very high melting points.