Which of the following is true of compasses?

a.
a compass has only a south pole.

b.
compasses are generally electromagnets.

c.
a compass has both a south pole and a north pole.

d.
compasses always point toward geographic north.

a. as the temperature increases, the kinetic energy of the gas molecules increases & the molecules move faster & further away from each other.

b. if you decrease the temperature of a fixed amount of gas at constant pressure, the combined gas law reduces to charles's law. in this case, volume will also decrease.