Question

which action causes breakers?
waves hit the shore at an angle and transport sand.
water flows away from the shore and moves sand with it.
underwater earthquakes cause motion throughout ocean water.
waves meet the shore and cause the crest to spill over the trough.

Explanation:

Breakers are formed when ocean waves approach the shallow shore. As the water depth decreases, the wave's base slows down while the crest continues moving forward, causing the crest to spill over the trough. The other options describe longshore drift (wave angle sand transport), backwash (water moving sand away from shore), and tsunami formation (underwater earthquakes), not breakers.

Answer:

Waves meet the shore and cause the crest to spill over the trough.