TASK DEFINITION: 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. 
PROBLEM: Fault lines appear underground. The fault lines grow over time. The rocks on each side of the fault lines rub against the rocks on the other side of the fault line. The rocks put pressure on each other. The rocks break from the pressure. The breaking of the rocks releases a lot of energy. The energy causes seismic waves. The seismic waves make the earth shake. 

SOLUTION: fault lines ,pressure ,rocks ,energy ,seismic waves 

PROBLEM: Animals and plants die in soft soil or mud. Sediment builds up over the remains. The remains decompose, leaving only trace amounts. The remaining parts over the years are replaced with mineral. A fossil is formed. 

SOLUTION: animals ,plants ,sediment ,remains ,mineral ,fossil 

PROBLEM: You breathe in. Air goes through all the little branches in your lungs to fill up the air sacs, or alveoli. Oxygen goes through the walls of the alveoli and into the capillaries. The oxygen goes into the bloodstream. Oxygen is left and carbon dioxide is picked up. You breathe it out through your lungs. 

SOLUTION:
air ,oxygen ,carbon dioxide