Find the weight of a 66 kg astronaut on Neptune.

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

An observation that requires measurement is called quantitative observable or qualitative

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.