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 ...

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 ...

Behind many of these beaches are sand dune systems which provide homes for diverse forms of wildlife including plants and insects, some so highly specialised that without these dune habitats ...

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 ...

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 ...

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.

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 ...

The work is expected to be completed in time for ground nesting birds and tourists to arrive About 14,000 tonnes of sand and shingle ... said restoring the shingle ridges helped protect people ...