Which of the Following Statements Concerning Graded Streams Is NOT

question 21

Multiple Choice

Which of the following statements concerning graded streams is NOT true?

• A) A graded stream responds instantaneously to any change in sediment load or discharge in such a way as to establish a new graded state.
• B) After a sudden decrease in sediment load, the gradient decreases, as does stream velocity.
• C) The equilibrium of a graded stream is temporary and lasts only until the next change in its environment.
• D) After a sudden increase in sediment load, the gradient increases, as does stream velocity.

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Definitions:

Pyroclastic Flow

A fast-moving current of hot gas and volcanic materials that flows down the slopes of a volcano during an explosive eruption.

Eruption Column

A cloud of hot volcanic ash and gas ejected into the atmosphere during an explosive volcanic eruption.

Viscous Lava

Lava that is thick and slow-moving due to its high silica content.

Volcanic Ash

Fine particles of rock and volcanic glass created during explosive volcanic eruptions.