Tharp was a pioneering cartographer and geologist whose meticulous maps of the Atlantic Ocean floor revealed the unseen and ...

The chain runs down the middle of the Atlantic Ocean (surfacing at Iceland ... It then solidifies into rock as it is cooled by the sea, creating new ocean floor. The speed at which new ocean ...

Secured critical habitat protection of 120 million acres for polar bears; 685 miles of beaches and more than 300,000 square miles of ocean for loggerhead sea turtles; 7,000 square miles for Hawaiian ...