Identify the best definition of the coastal erosion process known as attrition.
Pebbles and rocks carried by waves smash against each other, breaking into smaller, smoother pieces.
Waves fling sand and stones against the cliff base, wearing away the rock face.
Weak acids in the seawater slowly dissolve certain types of rock along the coast.
The force of heavy waves traps and compresses air inside cracks in the cliff, forcing the rock apart.