What term describes when air becomes trapped in joints and cracks on a cliff face and when the waves, the trapped air is compressed which weakens the cliff and causes erosion

answer; i believe the answer is hydraulic action;

emerald ash borer

the emerald ash borer is a green buprestid or jewel beetle native to north-eastern asia that feeds on ash species. females lay eggs in bark crevices on ash trees, and larvae feed underneath the bark of ash trees to emerge as adults in one to two years. hope this !