WEBVTT

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"River water moves
through waves,

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but ocean waves
move through water.

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A river wave is a misnomer.

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River water is in motion,
but the wave is not.

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Obeying gravity, a river and
whatever it carries suspended--

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silt and sand, pebbles,
leaves and sticks--

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flows over dislodged
rocks and upended logs,

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obstacles that once sheathed
give the appearance of waves,

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adopting the shape of
the ground beneath.

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Ocean waves give the
appearance of water

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progressively traveling
from one point to another.

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But in an ideal wave, water
follows a circular path

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in a vertical plane, rising
as the crest approaches

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and falling as it passes.

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Picture an orange
snatched by the tide.

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It zigzags along the
shore, rolling in and out,

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in and out, until someone
picks it up and throws it

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past the break.

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There, it will bob up
and down, tirelessly,

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without traveling far from
where it first landed.

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Once in Hawaii
after a heavy storm,

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you watched rainwater carve
a riverbed from the heights

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of a volcano to the beach.

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Morgan wants to know,
a provisional river.

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Yes, the way a
flooded street is."