Is corona the least dense layer in the sun? please fast

If steel is more dense that lake water, why can a boat float

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

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