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.
As the "plates" on each side of ridges in the seafloor are pulled away, lava comes up from the middle, hardens and "records" the current magnetic field.