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Melatonin is a hormone, released primarily by the pineal gland, that regulates the sleep–wake cycle. 3D ball-and-stick model, white background
Meeting of the waters of the Rio Negro and Rio Solimoes Rivers in front of Manaus port in Brazil
Titicaca Lake, landscape, Peru
Aerial View of Dalyan Delta
Dry land texture on the floor of a swamp. Global warming and greenhouse effect.
Tuzlata lake near Balchik town in Bulgaria.
Bosten Lake, Bayingolin Mongolian Autonomous Prefecture, Xinjiang, China
blue-green algae
A vast lake blanketed with icy layers under the open sky, creating a stunning natural landscape where water and wind collide in a breathtaking event
Oyster farms
Sediments in the Cunovo Dam on the Danube river - Slovakia
Water pollution, waste-water being released into river from the city sewage system
Riverside view of Tulsa City bridge with the Arkansas River flowing into a water inlet.
Frozen sea from northern Norway.
The beautiful landscapes of Kovada Lake, mountains and green area from the air. Isparta Lake District, Turkey
Aerial drone view of the Shubenacadie River, home to extreme tidal influence.
aerial view of of Nysa lake near Otmuchow town in Poland
Photo of a wetland landscape in the Setúbal district, South of Portugal.
Algae float on the surface of the water in the Black Sea, a toxic blue-green algae (Nodularia spumigena), ecological disaster, water bloom
Summer scenery at Bombay Hook National Wildlife Refuge, Smyrma, Delaware, USA
urban lake in India
Thol lake, near Ahmedabad, India
Engineering protection of new lake shores from landslides
Little plant on edge of the river
Lake Utonai, famous as a stopover for migratory birds
Close-up of a bog (wetland)
Coastline of rivers and lakes with harmful algal blooms. It is world environmental problem. Ecology concept of polluted nature.
Hanningfield Reservoir in Essex with water at a very low level. Photo taken August 14, 2022 - two days after an official drought status was declared for the East of England.
the red salt pans of aigues mortes in camargue
Qatar - Al Dhakira Mangroves
Free Images: "bestof:Delta-selinene.svg Chemical structure of delta-selinene Own 20 11 14 February 2013 UTC Ed Edgar181 Sesquiterpenes"
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