These ridges, which can reach up to 100 feet (30 ... See all the best images of Earth from space A group of five barchan, or ...

This striking false-color image shows massive wind-carved ridges and a "shadowy" patch of sand dunes at the heart of Iran's Lut Desert — one of the most extreme environments on Earth.

Today a great deal is known about dunes: how wind launches individual grains of sand and piles them into parabolas, ridges and other distinctive shapes; how plants steady dunes, and how waves ...

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 ...

No rose-colored glasses are needed at these stunning stretches of sand. You may have heard of white and black sand beaches, but what about shores with pink sands? Though rare, several countries ...

Sand tiger sharks, also known as gray nurse sharks, have a deceivingly ferocious look. They are large-bodied and display a mouthful of sharp teeth that protrude in all directions, even when the ...

Sand deposition, accretion ... symmetrical to asymmetrical dune ridges. The morphology of foredunes is varied but they can be classified into three main types: incipient foredunes, established ...

Seasonal yellow sand is expected to arrive over a wide area from northern to western Japan on March 25 and 26, adversely affecting visibility and aggravating respiratory problems. According to ...