In this map-based feature, gauge the scope and effects, both actual and potential, of the human "footprint" on our planet. To launch the interactive, click on the image at left.—Lexi Krock ...

A distinctive blue and green image of Earth reveals our planet's most remarkable features. At 4.54 billion years old, our home world is a venerable object. But it was only with the arrival of the ...

Earth is our home planet ... Trench is the deepest spot on our planet, extending down to 36,037 feet (10,984 m). The Nile is the longest river in the world, winding for 4,132 miles (6,650 km ...