instruction:
In this task, you are given a paragraph, and your job is to generate comma-separated entities present in the given paragraph. Generate entities from a given passage in such a way that (i) they are present in the paragraph, (ii) they are non-duplicate, (iii) they underwent a state change during the process. Avoid creating entities that (i) aren't present in the process paragraph and (ii) aren't significant. 
question:
Energy builds up in the crust of the earth. The energy causes the fault lines give way. The earth's plates move. The energy radiates outward from the fault in all directions. The seismic waves shake the earth as they move through it. 
answer:
energy ,fault lines ,earth's plates ,seismic wave 


question:
A fuel source must produce heat. Heat is used to create steam. Steam will be used to power turbines. Turbines will work together with magnets to generate electricity. Electricity or moving electrons will then flow through wires. The wires will carry electrons to homes and businesses remotely. 
answer:
Fuel Source ,Heat ,Steam ,Electricity 


question:
Coal is burned at a furnace. The resulting heat energy is used to heat water. The heated water is turned into steam. The steam drives a generator. Electricity is produced. 
answer:

coal ,heat energy ,water ,steam ,electricity