3-D print a piece of Mars for the holidays

There's a galaxy of gifts out there for space nerds. Researchers at The University of Texas at Austin may have just the thing to set your present apart: a model of Jezero Crater, the landing site of NASA's upcoming Mars 2020 ...

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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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