Liquid:

* Water: The most common example, found in oceans, rivers, lakes, and rain.

* Mercury: The only metal that is liquid at room temperature.

* Blood: A complex mixture of cells, proteins, and other substances.

* Honey: A viscous liquid made by bees.

* Gasoline: A flammable liquid used as fuel.

Solid:

* Ice: Frozen water.

* Rock: A naturally occurring solid composed of minerals.

* Wood: A solid material from trees.

* Diamond: The hardest natural substance known.

* Iron: A strong, metallic element.

Gas:

* Air: A mixture of nitrogen, oxygen, and other gases.

* Helium: A light, inert gas used in balloons.

* Carbon dioxide: A gas produced by breathing and combustion.

* Methane: A flammable gas found in natural gas.

* Chlorine: A poisonous gas used in disinfectants.

Plasma:

* Lightning: An extremely hot, ionized gas.

* Auroras: Glowing, colorful displays in the atmosphere caused by charged particles from the sun.

* The sun: Mostly composed of plasma.

* Neon lights: Gases that emit light when electricity passes through them.

* Fluorescent lights: Similar to neon lights, but use different gases.

Important Notes:

* State of matter can change: Water can be a solid (ice), liquid (water), or gas (steam).

* Plasma is sometimes called the fourth state of matter: It is a gas that has been heated to such high temperatures that its atoms have lost their electrons, becoming ionized.

* Many substances can exist in different states: For example, water can be a solid, liquid, or gas depending on the temperature and pressure.