Why can light be treated like a particle?

In apex! a liquid heated beyond a certain temperature becomes

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium