Edited by Dava Sobel

When two rivers meet
they are sometimes shy to mix.
The muddy load of sediment carried by one
keeps a distance from
pure blue-green of another.
Each one reflects a color
the landscape he carved,
sometimes with caution
and sometimes with turbulence.

The steep walls of the canyon testify
and scars of steady descent
water molecules attracted by gravity
destroying crystals and grains, craving clay particles
that fall and drift in the stream.
Rivers come out and meander
away from the harsh mountains
and to each other
begin to unload their cargo.

Separate paths become one
and a thicker stream dives,
hiding your sedimentary past
along the mixing line
where whirlpools test the water.
Clouds and clarity
complement each other,
and, over time,
dispersion and mixing
shift the current into balance.