The southern fringe of the Sahara, known as the Sahel , is believed by some scientists to be advancing by as much as 9 miles (15km) a year. ...

About 3.5 billion years ago Earth was covered by one gigantic reddish ocean. The colour came from hydrocarbons .  The first life-forms on Ea...

Polar Bear Where it lives Canada, Greenland, Russia, Norway, and Alaska, The U.S.A. Why it is threatened Due to shrinking amounts of sea ice...

Classifying dinosaurs and all other living things can be a complicated matter, so scientists have devised a system to help with the process...

The 1883 eruption of Krakatoa was just one phase in a continuing cycle of destruction and rebirth in the Sunda Strait . More than 1 million...