A 1718 map called The Course of the Mississippi, or the St. Louis, the famous river of North America shows how one cartographer imagined the Great Lakes and the Mississippi River connecting.

These factors, especially in the Balcones Escarpment landscape in Central Texas, make Flash Flood Alley one of the most flood ...

A map shows the ozone hole above Antarctica in September, when it was the size of North America. The ozone protects the Earth from the sun's ultraviolet rays.