Poem: ‘Confluence’

Science in meter and verse

An aerial view looking straight down at two rivers converging.

Michael Warren/Getty Images

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Edited by Dava Sobel

When two rivers meet,
they sometimes hesitate to mix.
The murky sediment load carried by one
keeps its distance from
the clear blue-green of the other.
Each reflects the color
of the landscape it has carved,
sometimes with caution,
and sometimes with turbulence.

Steep canyon walls bear witness
and scars of the steady descent
of water molecules pulled by gravity,
eroding crystals and grains, thirsty clay particles
that tumble and drift in the flow.
The rivers emerge and meander
away from the rugged mountains
and toward each other,
beginning to unburden their loads.


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The distinct paths become one,
and the denser stream ducks under,
hiding its sedimentary past
along the line of mixing,
where eddies test the waters.
Clouds and clarity
complement each other,
and, with time,
dispersion and blending
shift the current into balance.

Marianne Karplus, a geophysicist and associate professor at the University of Texas at El Paso, is inspired to write poetry during her scientific field expeditions in the western U.S., the Himalaya and Antarctica. Her poems have been published in several literary magazines.

More by Marianne Karplus
Scientific American Magazine Vol 328 Issue 5This article was published with the title “Confluence” in Scientific American Magazine Vol. 328 No. 5 (), p. 24
doi:10.1038/scientificamerican0523-24

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