streambed

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Martian surface near the equator. The right half of the picture is dominated by craters; the lighter areas on the left are channels that were probably caused by water runoff from the west (left). This false-colour composite picture is based on high-resolution black-and-white and low-resolution colour images taken by the Viking 1 and Viking 2 spacecraft.

cratered plains and cratered highlands in Lunae Planum

underfit stream

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Aerial view of the Amazon River in the Amazon rainforest near Manaus in Brazil. South America

How Long Is the Amazon River?

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Entrants falling and tumbling over while chasing the cheese at the 2016 'Cheese Rolling' held at Cooper's Hill, in the Cotswolds, Brockworth England

7 of the World’s Most Dangerous Festivals

World Data Locator Map: Australia

Is Australia an Island?

Srinivasa Ramanujan, Indian mathematician and autodidact.

6 Interesting Facts about Srinivasa Ramanujan

Facsimile of one of William Henry Ireland's forgeries, a primitive self-portrait of William Shakespeare(tinted engraving). Published for Samuel Ireland, Norfolk Street, Strand, December 1, 1795. (W.H. Ireland, forgery)

The Time a Law Clerk Successfully Forged a New Shakespeare Play to Impress His Dad

Coriander leaves, fresh green cilantro on wooden background, herbs

Why Does Cilantro Taste Like Soap to Some People?

Indian hijras participate in a religious procession in Gandhinagar, India, some 30 kilometers from Ahmedabad, on March 22, 2017. Hijra is a term used in South Asia which refers to transgender individuals who are born male. (gender identity, gender expression)

6 Cultures That Recognize More than Two Genders

Colorful winter sunset

What's the Difference Between a Solstice and an Equinox?

streambed: Media

hydrology

Images

Streambed

Streambed

A streambed in the Porphory Basin near Silverton, Colo.

© rian Erickson/Shutterstock.com

Martian surface near the equator. The right half of the picture is dominated by craters; the lighter areas on the left are channels that were probably caused by water runoff from the west (left). This false-colour composite picture is based on high-resolution black-and-white and low-resolution colour images taken by the Viking 1 and Viking 2 spacecraft.

Martian surface near the equator. The right half of the picture is dominated by craters;...

Photo NASA/JPL/Caltech (NASA photo # PIA00413)

cratered plains and cratered highlands in Lunae Planum

cratered plains and cratered highlands in Lunae Planum

Viking photograph of the cratered plains/cratered highlands in Lunae Planum. The...

Courtesy of the Jet Propulsion Laboratory/National Aeronautics and Space Administration

underfit stream

underfit stream

Idealized map view of a stream that is underfit in relation to its valley. The contrast...

Encyclopædia Britannica, Inc.

VIEW MORE in these related Britannica articles: