Density is the amount of matter per space or mass/volume.

3. if the dartboard below is used to model an atom, which subatomic particles would be located at z?

What is a scientific theory? a. a scientist's guess about how something works b. the results of an experiment obtained using the scientific method c. a proven fact that will never change d. an idea that is backed by data from many sources

Salt in oceans comes from and of rocks