Winds, waves, tides and ice are continually at work, eroding, transporting and depositing the rock, gravel, sand and mud of the shore.
(Winds, waves, tides and ice; are; continually; L:at work) (Winds, waves, tides and ice; eroding; )
Winds, waves, tides and ice Winds, waves, tides and ice
are eroding
continually L:at work