Related topics: climate change · earth · nasa · carbon dioxide · atmosphere

45 reasons the Great Barrier Reef is in trouble

When the managers of the Great Barrier Reef recently rated its outlook as very poor, a few well-known threats dominated the headlines. But delve deeper into the report and you'll find that this global icon is threatened by ...

Madagascar's unique dugongs in danger

Scientists have used historic DNA to discover some of the highest-risk populations of the endangered dugong are so genetically distinct, losing them would be the equivalent of losing a species of elephant.

Do animals control earth's oxygen level?

No more than 540 million years ago there was a huge boom in the diversity of animals on Earth. The first larger animals evolved in what is today known as the Cambrian explosion. In the time that followed, the animals evolved ...

GPM finds rainfall waning in extra-tropical storm Gabrielle

The Atlantic Ocean's Gabrielle has made a second transition and the Global Precipitation Measurement mission or GPM core satellite provided information about the rate in which rain was falling within the now extra-tropical ...

Lightning 'superbolts' form over oceans from November to February

The lightning season in the Southeastern U.S. is almost finished for this year, but the peak season for the most powerful strokes of lightning won't begin until November, according to a newly published global survey of these ...

page 1 from 6

Ocean

An ocean (from Greek Ωκεανός, Okeanos (Oceanus)) is a major body of saline water, and a principal component of the hydrosphere. Approximately 71% of the Earth's surface (an area of some 361 million square kilometers) is covered by ocean, a continuous body of water that is customarily divided into several principal oceans and smaller seas. More than half of this area is over 3,000 meters (9,800 ft) deep. Average oceanic salinity is around 35 parts per thousand (ppt) (3.5%), and nearly all seawater has a salinity in the range of 30 to 38 ppt.

This text uses material from Wikipedia, licensed under CC BY-SA