A student heats a liquid on a burner. What happens to the portion of liquid that first begins to warm? It loses energy. It becomes less dense. It sinks downward. Its molecules get closer together. PLEASE HURRY

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

Gasoline comes from petroleum, which is made from ancient living things. petroleum, therefore, contains a type of energy. a. heat b. nuclear c. biological d. chemical potential

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?