What do the arrows indicate ? A)plate movement. B)ocean flow. C)mid ocean ridge. D)continental drift.

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

Once similarity and one difference between a mixture of elements and a mixture of compounds

What does a numerical subscript following an element in a chemical formula mean?