All of the Following Statements About Cross- Bedding Are True

question 18

Multiple Choice

All of the following statements about cross- bedding are true EXCEPT:

• A) cross- bedding is usually formed by deposition of sediments from wind or water.
• B) cross- beds form when particles drop from still water.
• C) changes in direction of wind or water currents are recognizable within cross- beds.
• D) cross- beds are formed when a sedimentary layer is deposited at an angle to the underlying bed.

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Definitions:

Just-noticeable Difference

The smallest change in intensity of a stimulus that can be detected.

Absolute Threshold

The minimum intensity of a stimulus at which it can be detected by an individual at least 50% of the time.

Difference Threshold

The minimum difference in stimulation that a person can detect 50% of the time, also known as just noticeable difference (JND).

Sensory Adaptation

The process by which sensory receptors become less sensitive to constant stimuli over time.