Becuase they have water and oxygen carbon dioxide in them
The valence electrons is last outer shell of an atom. So it is the last number of the electron configuration on the periodic table.
Gravity is the force of attraction between two objects, and Earth's gravity pulls matter downward, toward its center. It pulls precipitation down from clouds and pulls water downhill. Gravity also moves air and ocean water. ... Gravity pulls denser air and water downward, forcing less dense air and water to move upward.
Each of the following is a characteristic of acids except D. Solid.