How many type of units

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island