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 ...

One set of ripples, located in an area called the Prow outcrop, lies within what was once a field of wind-blown sand dunes. The other, found in the sulfate-rich Amapari Marker Band, points to the ...

Berger’s project, Insights into the Martian Environment Through Pattern Analysis of Compound Dunes, focuses on studying dune ...

The rolling dunes ripple across the majority of the park’s 1,550 sq km, and during certain times of year, natural rainwater ...

Such small ripples in fine sand are formed by the action of small ... was discovered in a region that once contained wind-blown dunes. The other set, found nearby in the Amapari Marker Band ...