waves and land forms

Question 1

destructive

Answer 1

longer fetch, high waves
20m wavelength
steepen rapidly until they plunge over
causes strong backwash
material moves downwards forming a breakpoint bar

Question 2

constructive

Answer 2

small waves, 100m wavelength
swash moves up beach, looses volume due to percolation
weak backwash increases gradient f beach
forms berms and ridges at sandy beaches