True or false energy must be added to the gas element in order for light to be emitted . A. True
B. False

Which of these statements is true? a. quarks pair with leptons to form protons and neutrons. b. quarks pair with bosons to form photons. c. quarks pair with photons to form protons and neutrons. d. quarks pair with other quarks to form protons and neutrons. e. quarks pair with electrons to form protons.

The air that we breath is made mostly of which gaseous molecule

What causes the development of most clouds and precipitation in the atmosphere?