Sand grains that are very round and dry (moisture on the dune's surface can cause sand to clump together, inhibiting avalanching) Grains on the dune's surface that are "well sorted," meaning they ...

The mud, sand, gravel, cobbles and boulders they shed are washed into streams, which come together to form rivers ... But you ...

Ask your students to think about different ways to make the sand grains stick together. One way to bind sand grains together is to mix it with cement and water, which produces concrete.

When the grains are exposed in the lab, they release the energy in light form and scientists can calculate their age. "In our dark laboratory, we see light from these sand grains. The brighter the ...

Drawing from millions of grains, monks gingerly place sand onto the surface using thin metal funnels called chak-pur. The construction requires such detailed work that it often takes several days, or ...

A woman said she found a letter that might date to 1945. “Was he on a ship?” she said she wondered of the writer. “Did they ...

Tiny grains of sand from the Sahara Desert are to blame ... N.S. "Hurricanes are not likely to form when you've got a lot of this dry air from the desert in it." The dry air prevents the buildup ...

And desert sand, like ocean waves, rolls and bounces. And these self-organizing individual grains create ever-shifting wave-shaped ripples on the dune’s surface. And human hands form images that ...

The age of one of Earth's largest and most complex types of sand dune has been calculated for the first time. Star dunes - or pyramid dunes - are named after their distinctive shapes and reach ...