What must be true of an object that has gravitational potential energy?
a. it is stretched beyond a certain length.
b. it is above a reference point.
c. it is compressed shorter than a given length.
d. it is moving past a reference point.

The correct choice mus be

B.It is above a reference point.

Gravitational potential energy is the energy possessed by an object when it is at some height relative to a reference point.

when an object is stretched beyond certain length it stores elastic potential energy and not gravitational potential energy

when an object is compressed beyond certain length it stores elastic potential energy and not gravitational potential energy.

when an object is moving, it has kinetic energy.

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms