Rocks crack and form earthquakes because of what?
plz I'm cute

Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. They don't just slide smoothly; the rocks catch on each other.

when the rocks are underground and they break along the fault this causes the plates to slide or bump into each other  which is called an earth quake hope this helps

Explanation:

and okokk to cut

your answer is "the 1950's"

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies