What causes the huge amount of inward pressure when a star begins to form?
A) heat
B) gravity
C) electromagnetic attraction
D) none of these

One significant difference between an ionic bond, where electrons are taken from one atom and added to another atom, and a covalent or metallic bond, where electrons are shared is

The three types is stress that act on earths rocks are compression, tension, and

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false