Which of the following causes earthquakes?

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 both used airplanes and aircraft carriers in these battles.  During this period aircraft carriers were emerging to be important vessels in both sea and aerial warfare.  They were becoming the weapon of choice since they can transport bombers and fighter planes to bomb and attack enemy planes and ships.