Marie Read / Snowy Owl (Nyctea scandiaca) female perched, Amherst Island, Ontario, Canada, January.

Alex Mustard / Blue shark (Prionace glauca) near the surface of the English Channel. Penzance, Cornwall, England, British Isles. North East Atlantic Ocean, August. Digitally manipulated to improve composition see 1...

Jack Dykinga / Eroded formation known as the 'Tres Maries', in the Valle de la Luna. One million year old composition of gravel, clay, salt, gems and quartz, against The Milky Way and Southern Cross in the night sky...

Jack Dykinga / Eroded rock formation known as the 'Tres Maries', in the Valle de la Luna. One million year old composition of gravel, clay, salt, gems and quartz, against The Milky Way and Southern Cross in the nigh...

Marie Read / Snowy Owl (Nyctea scandiaca) female preparing to take flight from its perch on a fence, Barrie, Ontario, Canada. February.

John Cancalosi / Rhodochrosite a manganese carbonate mineral with chemical composition MnCO3. In its (rare) pure form, it is typically a rose-red color, but impure specimens can be shades of pink to pale brown, Argent...

Kirkendall-Spring / Morning Glory Pool in Upper Geyser Basin, Yellowstone National Park, Wyoming, USA. September 2015. The pool has changed from its original blue colour to green due to tourists throwing rocks, pennies a...

John Cancalosi / Syenite from the Steffin Complex, Marathon County, Wisconsin, USA. Syenite is a coarse-grained intrusive igneous rock of the same general composition as granite but with the quartz either absent or pr...

John Cancalosi / Rhyolite, an igneous, volcanic rock, of felsic (silica-rich) composition.

Marie Read / Pigeon Guillemots (Cepphus columba), group interacting on a rock over the ocean, Montana De Oro State Park, California, USA, July. (Digitally retouched image - bird at far left, head added from previo...

Eric Baccega / Icerberg at sunset with full moon, in Davis Strait, off south Baffin island, Nunavut, Canada, August 2010

Guy Edwardes / Algal blooms and moss in shallow freshwater pool on black volcanic sand, Near Vik, Southern Iceland June