Only a few sand grains entered as he sealed the opening.

Wind is moving sand grains almost all the time.

An individual particle in this range size is termed a sand grain.

Adults are about 3 mm long and live in the spaces between sand grains.

The fine white sand grains have been used for filling hour glasses.

But at this distance, it's like trying to pick out individual sand grains on earth from a satellite.

He could feel every sand grain he'd picked up on the trek through the desert.

The sand grains are found coated with a thin film of clay.

Youth cases are 1 mm long and entirely covered by sand grains.

She tried to concentrate on the composition of the sand grains.