Where in the atom is most of its mass concentrated? what is this mass composed of?

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question

Table sugar completely dissolved in water is an example of a?