This document discusses the four states of matter: solid, liquid, gas, and plasma. It provides descriptions of each state in terms of the particle arrangement, energy, and distance between particles. Solids have particles that are tightly packed and vibrate in a fixed position. Liquids also have tightly packed particles that can slide over one another. Gas particles are very far apart and move freely. Plasma is an ionized gas that is affected by magnetic fields and is the most common state of matter at extremely high temperatures. Examples of where plasma can be found include flames, lightning, auroras, and inside stars like the Sun.