1.   Do we mean something like one sand grain every square metre of sea-floor per minute, per day, per year?

2.   Specimens from unconsolidated gravels are not difficult to clean, any adherent sand grains being easily removed using a stout pin.

3.   The turbulence in the water film around the sand grains caused by your footfalls triggers the fluorescence.

4.   This new species lives below the surface of the rock in the interstices of its sand grains.

5.   Brass balls were used instead of sand because they are more uniform in size than sand grains.

6.   From fossilized fish teeth the size of sand grains, scientists hope to deduce a sweeping shift of deep ocean currents millions of years ago.

7.   Most meteors are small, about the size of sand grains.

8.   The researchers found cold-water foraminifera in the same seabed strata as bigger concentrations of sand grains.

9.   The Voyagers revealed that the magnificent rings are composed of ice and rock ranging in size from sand grains to small houses.

10.   Two types showed well-defined structures in which the layers were tilted at angles and had distinctive textures according to various sizes of sand grains.