Template:POTD/2012-03-02
Picture of the day archives
:
2012 March
<
2012 March 1
2012 March 3
>
Picture of the day
Diatomaceous earth
– a naturally occurring, soft,
siliceous
sedimentary rock
made up of the
cell walls
/
shells
of single cell
diatoms
– as viewed under
bright field
illumination on a
light microscope
. The primary uses of diatomaceous earth are for cleaning (scouring),
filtration
, heat-resistive
insulation
and as an inert absorbent
substrate
.
Photo:
Richard Wheeler
Archive
–
More featured pictures...