Define the following: floodplain, delta, alluvial fan, and oxbow lake.

A floodplain or flood plain is an area of land adjacent to a stream or river that stretches from the banks of its channel to the base of the enclosing valley walls

delta IDK

 relating to or derived from alluv

An oxbow lake is a U-shaped body of water that forms when a wide meander from the main stem of a river is cut offium

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what is the point of this site if you can literally use a calculator  

answer; ///i believe the answer is ( a hitch and signals);