What does Ra Ra Ah Ah Ah Ro Ma Ro Ma Ma Ga Ga O La La mean?

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

How is an endothermic reaction identified