Smoke and fog (Smog), Dirt and water (Mud), Sand, water and gravel (Cement), Water and salt (Sea water), Potassium nitrate, sulfur, and carbon (Gunpowder), Oxygen and water (Sea foam), Petroleum, hydrocarbons, and fuel additives (Gasoline)
Examples of compounds:
sodium chloride, sucrose, nitrogen gas, a sample of copper, and water.
Examples of elements: carbon, oxygen, hydrogen, gold, silver and iron.
