Why Does Water Released from a Dam Erode the Streambed

question 73

Multiple Choice

Why does water released from a dam erode the streambed so much more than it would have before the dam existed?

• A) It has a greatly increased velocity.
• B) It has more stream power than it would have had before the dam.
• C) The dry stream bed below the dam weakens while it is left dry.
• D) The stream power now exceeds the sediment load by a great amount.

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Definitions:

Mackintosh's Attentional Theory

A theory proposing that the allocation of attention during learning is influenced by the predictability of stimuli, affecting conditioning strength.

Conditioned Response Strength

The intensity or magnitude of a response that has been learned under conditional circumstances.

Conditioning

A process of behavior modification in which a subject learns to respond in a desired manner to a previously neutral stimulus that has been repeatedly presented along with an unconditioned stimulus.

Unconditioned Response Sequences

The natural, automatic reactions that occur in response to an unconditioned stimulus without prior learning or conditioning.