What Is the Path Followed by a Sand Grain from a Succession

question 140

Multiple Choice

What is the path followed by a sand grain from a succession of waves impinging obliquely onto a beach?

• A)A path parallel to the beach, but well offshore as sand is only moved by longshore currents not by breaking waves.
• B)A sawtooth path, driven obliquely up the beach face with the swash then straight down the beach face with the backwash.
• C)A straight path, right at the shoreface, pushed along parallel to the beach by the breaking wave.
• D)Perpendicular to the wave front, obliquely up the beach on the swash, then reflected out at an opposite but equal angle with the backwash.

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