Another telltale hint that Earth's continents were all one land mass ... This would involve the Atlantic and Indian oceans closing up and joining the Americas to Europe and Africa, eventually ...

Earth formed 4.54 billion years ago. The first period of the history of the Earth was known as the Hadean Period which lasted ...

Over the past 20 years, scientists have observed a widespread shift in the color of our oceans, signaling big changes beneath ...

Plate tectonics is the theory that Earth's outer layer is ... around 200 million years ago. Oceans filled the areas between these new sub-continents. The land masses continued to move apart ...

The Earth's interior is composed ... thick beneath the oceans to an average of 25 miles (40 kilometers) thick beneath the continents. Currents within the mantle have broken the crust into blocks ...

A photo of the earth and its oceans taken from space ... The Pacific Ocean stretches from the continents of Asia and Oceania on the east, to North and South America on the west.

"Our new picture of Mars," Pollack said yesterday, "is much like the Earth without oceans." The dark areas ... with a thick layer of dust. Mars has continents, Pollack continued, it must have ...