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417 words used in the labs.

Find a term from the labs, understand the process behind it, and see how it appears in the landscape. Each entry connects an explanation with a real observation and a model you can explore.

Confluence

The place where two streams or rivers meet. Downstream discharge usually includes water from both channels, although its timing depends on travel and storage. Sediment bars and mixing patterns may reveal the different flows at the junction.

What to look for

The Rhine–Moselle confluence at Koblenz, photographed in 1988. A tributary joins the main channel here.

The Moselle joins the wider Rhine beside the city of Koblenz, Germany.
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Explore further with USGS water glossary · USGS volcano glossary · NPS glacial geology · NASA Earth facts. Photograph acknowledgements are collected on the Image credits page.