Possible organic compounds found in Mars crater rocks

A study published in Science analyses multiple rocks found at the bottom of Jezero Crater on Mars, where the Perseverance rover landed in 2020, revealing significant interaction between the rocks and liquid water. Those rocks ...

Mangrove forest found living in freshwater

An international team of researchers has found a mangrove forest living in a freshwater part of the Amazonian delta. In their paper published in the journal Current Biology, the group describes their study of the Amazonian ...

Researchers lay out a path to saving the Mekong Delta

Nearly 20 million people live in Southeast Asia's Mekong Delta, which is also the source of 7–10% of internationally traded rice. But the delta will be nearly entirely underwater by the end of the century if water management ...

The Brazil resort town disappearing into the sea

Vultures roam the sand in the Brazilian resort town of Atafona amid the ruins of the latest houses destroyed by the sea, whose relentless rise has turned the local coastline into an apocalyptic landscape.

The Mekong Delta in Vietnam is sinking. Can sediment save it?

In Vietnam's Mekong Delta, home to about 17 million people, large areas of land have been poldered for the cultivation of crops such as rice and shrimp. At the moment, the delta is on average less than a meter above sea level. ...

Rover images confirm Jezero crater is an ancient Martian lake

The first scientific analysis of images taken by NASA's Perseverance rover has now confirmed that Mars' Jezero crater—which today is a dry, wind-eroded depression—was once a quiet lake, fed steadily by a small river some ...

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River delta

A delta is a landform that is created at the mouth of a river where that river flows into an ocean, sea, estuary, lake, reservoir, flat arid area, or another river. Deltas are formed from the deposition of the sediment carried by the river as the flow leaves the mouth of the river. Over long periods of time, this deposition builds the characteristic geographic pattern of a river delta.

Herodotus the great historian coined the term delta for the Nile River delta because the sediment deposited at its mouth had the shape of the upper-case Greek letter Delta: Δ.

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