Sea level changes (5)
I believe the answer is:
tides
(Other definitions for tides that I've seen before include "Rises and falls, nautically" , "They ebb and flow" , "Diets (anag.)" , "Critical moments" , "Lunar-driven movements of oceans" .)
I believe the answer is:
tides
(Other definitions for tides that I've seen before include "Rises and falls, nautically" , "They ebb and flow" , "Diets (anag.)" , "Critical moments" , "Lunar-driven movements of oceans" .)