David Shale / Enteropneust worm / Acorn worm (tergivelum cinnabarinum) from the North Atlantic Ocean, Northern Pink variety, Feeds on sea floor sediment leaving behind characteristic spiral traces, depth approx 27...

David Shale / Enteropneust worm / Acorn worm (Tergivelum cinnabarinum) from the North Atlantic Ocean, Northern Pink variety, Feeds on sea floor sediment leaving behind characteristic spiral traces, depth approx 27...

Wild Wonders of Europe / Cairns / Aerial view over Lake Laitaure showing silt deposits from the Rapa river forming sand spits and vegetational growth, Sarek National Park, Sweden., September 2008

Juergen Freund / Crocodile snake eel {Brachysomophis crocodilinus} burrowing in sediment.

Norbert Wu / Red Mangrove (Rhizophora mangle) roots create sediment filter to clear water, young trees rise up from salt water, Palau

Norbert Wu / Seagrass beds serve as sediment traps and nurseries, Palau

Ashley Cooper / Coastal flood defences in the Sunderbans a low lying area of the Ganges Delta that is vulnerable to sea level rise, India. December 2013.

Ashley Cooper / River full of water contaminated by mine effluent in La Paz, Bolivia. October 2015

Ashley Cooper / River full of water contaminated by mine effluent in La Paz, Bolivia. October 2015

Ashley Cooper / Scientist using dye tracing techniques as part of a study to measure the speed of the Russell Glacier near Kangerlussuag Greenland. July 2008

Ashley Cooper / Scientist taking measurements as part of a study to measure the speed of the Russell Glacier near Kangerlussuag, Greenland. July 2008

Ashley Cooper / Scientist using dye tracing techniques as part of a study to measure the speed of the Russell Glacier, near Kangerlussuag, Greenland. July 2008