Describe the refraction process that occurs when waves reach an irregular coastline. Why is the coastline straightened? Describe the process of beach drift and the movement of longshore currents to...

Describe the refraction process that occurs when waves reach an irregular coastline. Why is the coastline straightened?

Describe the process of beach drift and the movement of longshore currents to produce littoral drift.  Explain how a seismic sea wave attains such tremendous velocities. Why is it given the name tsuna?