Lake in US turns into an 'unusual shade of turquoise' after toxic algae bloom

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. Experts said the colour is due to abundance of calcium carbonate in the water. It's rare but not dangerous to the lake's aquatic life, they added.