Near the Earth's surface, friction causes the wind to be slower than it would be otherwise.
(it; would be; otherwise) (friction; causes; the wind to be slower; L:Near the Earth's surface) Context(friction causes,List([26, 41))):(the wind; to be; slower than it would be otherwise)
friction causes,List([26, 41))
it friction the wind
would be causes to be
otherwise
the wind to be slower L:Near the Earth's surface
slower than it would be otherwise