The earth's rotation introduces a Coriolis acceleration which induces flow in the frame of reference of the earth which is to the right of the motion in the northern hemisphere andThere a stratum of rock, softer than those above, had been hollowed out by the action of time until it was like a deep groove running along the sides of the canyon.
(a deep groove; running; L:along the sides of the canyon) (a Coriolis acceleration; induces; flow in the frame of reference of the earth) (the earth; is; to the right of the motion in the northern hemisphere) (it; was; like a deep groove)
a deep groove a Coriolis acceleration the earth it
running induces is was
L:along the sides of the canyon
flow in the frame of reference of the earth
to the right of the motion in the northern hemisphere
like a deep groove