The existence of fjords is evidence that glaciers can erode well below sea 13. Glacial ice moves uphill during times of glacial retreat. Upper atmospheric ozone is created by lightning. Chlorofluorocarbons and methyl bromide breakdown in the upper atmosphere releasing Cl and Br, respectively, which in turn destroy ozone. Rising sea level causes barrier islands to shift their position landward.
Sea stacks represent erosional remnants following sea cliff retreat.
Marine terraces, such as those of Palos Verdes, are indications of uplift or lowering of sea level. The El Nino phenomenon is basically a current reversal, caused by slack winds. The greater the angle of waves to shore, the greater the amount of longshore current. The motion of particles suspended in waves increases with depth. Sand accumulated on the north side of a groin indicates that the direction of longshore drift is from the north.