The document discusses the three principle states of matter - solids, liquids, and gases - and their defining properties. Solids have a definite volume and shape, liquids have a definite volume but no definite shape, and gases have no definite volume or shape. The document also includes diagrams illustrating the arrangement and motion of particles in each state, with particles in solids locked in place, particles in liquids able to move and slide past one another, and particles in gases moving quickly past one another. Examples of each state of matter are also listed.