Question 1
The zigzag movement of sand grains along a beach is ________.
◦ called beach drift
◦ very unusual and seldom occurs
◦ caused by obliquely breaking waves
◦ both caused by obliquely breaking waves and called beach drift
Question 2
Rip currents are dreaded by surf swimmers everywhere. The standard recommendation for swimmers is if you get caught in a rip current, swim parallel to the shore. Why?
◦ The current is moving offshore but is confined, so by swimming parallel to shore you can swim out of the current.
◦ It will carry you in the longshore current which will take you ashore.
◦ This recommendation is wrong; you should swim toward the shore as fast as you can.
◦ This recommendation is wrong; you should swim with the current and wait for it to die away, then swim to shore because the currents dissipate quickly.