The difference is a matter of size: ripples are small ridges of sand with a height (amplitude) typically less than 4 cm and wave lengths (crest to crest) less than 60 cm, while dunes have the same ...

A historic shipwreck has been discovered after emerging from beneath a sand dune, according to a recent study. The wreck, which represents the remains of a roughly 90-foot-long vessel, was found ...

Researchers have discovered two sets of ancient wave ripples on Mars, signatures of long-dried bodies of water preserved in ...

Kathlene Persoff: “Strong Atlantic winds at Palmetto Dunes Beach on Hilton Head Island, South Carolina, created graceful ripples in the sands.” Shauna Dalziel: “The sky, the sea, the sand ...

L ong ago, flowing wind and water shaped Mars's malleable sand and sediment into dunes, ripples and other landscape patterns, called bedforms. Over billions of years, some of these landforms ...