26 The Sea 
Near the shores of the continents, the bottom is disturbed 
by the incessant movement of the sea water, the lashing of 
the waves, and currents. The bottom is covered with earth 
ce 
A portion of the ocean bottom showing ripples presumably formed 
by subsurface currents. 
deposits—mud, sand, gravel, and other materials which were 
washed down there from the land, and coral muds and sands. ~ 
An ordinary navigation chart shows what types of deposits 
