The motion of the water near the bottom is retarded by friction, which causes the wave to slow down.
(The motion of the water near the bottom; is retarded; by friction) (friction; causes; the wave to slow down) Context(friction causes,List([55, 77))):(the wave; to slow down; )
friction causes,List([55, 77))
The motion of the water near the bottom friction the wave
is retarded causes to slow down
by friction
the wave to slow down