Deltas are complex depositional landforms that develop at the mouths of rivers. They are composed of sediment that is deposited as a river enters a standing body of water and loses forward momentum. Famous deltas include the Mississippi delta in...

A delta is a landform where the mouth of a river flows into an ocean, sea, desert, estuary, lake or another river. It builds up sediment outwards into the flat area which the river's flow encounters (as a deltaic deposit) transported by the water and...

Kidnappers on Wednesday released two foreign oil workers abducted in Nigeria's restive southern oil region.The Dutch and British nationals were freed in southern Bayelsa state and were in "very good health," said Godknows Igali, a government official who helped mediate their release. He spoke by...

Kidnappers grabbed six Filipino workers off a merchant ship Saturday in the latest hostage-taking in Nigeria's restive southern oil-producing region, officials said.The vessel was heading to the oil port of Warri with a crew of 14 when unidentified gunmen boarded and took away the six...

Faster Chinese trains running at about 125 mph began service Wednesday as part of a bid to keep up with ballooning transport demand, state media reported.The first of scores of high-speed trains left Shanghai Wednesday morning for the nearby city of Suzhou, making the 53-mile...