The Pyramid Lake in Nevada, US has turned into an ‘unusual shade of turquoise’ following a toxic algae bloom. Joint Polar Satellite System, a collaborative National Oceanic and Atmospheric Administration and NASA program, said that the colour is due to abundance of calcium carbonate in the water. It's rare but not dangerous to the lake's aquatic life According to New York post, Pyramid Lake is located in a remote desert area of the Pyramid Lake Paiute Tribes’ Reservation, about 40 miles northeast of Reno, and is fed by the Truckee River. Water samples reported from July 22 showed cyanotoxin toxic levels that may cause harm to humans and pets. Residents are urged to stay out of the water until further notice
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