Exam 16: Streams and Floods

A stream can increase its length by _____.

Discharge is the product of average stream width times average stream depth times ___.

Movement of cobbles and boulders by rolling,sliding,or dragging in a streambed is called ____ load.

Deltas may be river dominated,tide dominated,or _____.

Stream-dominated river deltas,like the Mississippi,display the characteristic triangular shape of a delta.

Certain features on the planet Mars resemble _____ on Earth.

A stream can lengthen its valley by headward erosion.

The gravel bed load of a stream moves by _____.

A ____ drainage pattern is one in which streams diverge outward likes spokes on a wheel.

Flood control structures along the Mississippi River surrounding New Orleans are predominantly _____.

A stream can lengthen itself by ____.

A(n)___ is a step-like landform found above a stream and its floodplain.It is a remnant of an older flood plain or river-eroded flat surface.

An alluvial fan is a fan- or cone-shaped pile of sediment that forms where a stream emerges from a narrow mountain canyon.

Sheetwash is a thin layer of unchanneled water flowing downhill.

___ beds form the main body of a delta with angles of inclination up to 20 to 35 degrees in small sandy deltas.

A(n)__ is the body of sediment deposited at the mouth of a river when the river's velocity decreases.

The process of deepening a valley by erosion of the streambed is called downcutting.

Stream discharge is one of the most important factors that controls stream velocity.

_______ deposits are found in streams where running water has mechanically concentrated heavy sediment such as gold.

Low stream velocity generally results in erosion and transportation of sediment.