Historically, there have been four oceans: the Atlantic, Pacific, Indian, and Arctic. On Feb. 9, U.S. Secretary of the Interior Doug Burgum announced the Gulf of Mexico had officially been changed to ...

All five oceans are connected with each other ... Image caption, Image of the Earth from a satellite. The ocean floor can be flat or it can have caves and mountains. The weather can be very ...

But while lifeless during that time, the planet was already covered by vast oceans dotted with hydrothermal vent systems that ...

existed in Earth’s oceans and atmosphere. So a major implication of the study is that pale-green dot worlds viewed from space are good candidates planets to harbour early photosynthetic life. The ...

The changes in ocean chemistry were gradual. The Archaean period lasted 1.5 billion years. This is more than half of Earth's history. By comparison, the entire history of the rise and evolution of ...

The earliest lifeforms, cyanobacteria, appeared around 4 billion years ago. These organisms, now known as algae, were among ...