Plz help its due 10 am

Asample of a gaseous substance changes into liquid. this process is called (blank) and it takes place when heat is (blank) a gaseous system

Which force is most responsible for binding together an atom's protons and neutrons? electrostatic gravitational nuclear magnetic

Astone is thrown into a pond. what happens to the amplitude of the resulting waves as they get farther from the point where the stone hit the water? explain.