The swaths of dark water – more commonly known as red tide – were seen off Newport Beach, Crystal Cove State Beach, Laguna Beach and Strand Beach in Dana Point.

NASA’s Viking mission identified – among many other fascinating things – some curious dark streaks following downward slopes ...

As the glaciers of South America retreat, the supply of freshwater is dwindling and its quality is getting worse. Dark red pools of meltwater from acid rock drainage on Pastoruri peak in the ...