picture of the day

https://ift.tt/2Kqs7IJ https://ift.tt/2tNzfol Turquoise Swirls in the Black Sea.jpg Most summers, jewel-toned hues appear in the Black Sea. The turquoise swirls are not the brushstrokes of a painting; they indicate the presence of phytoplankton, which trace the flow of water currents and eddies. July 3, 2018