A Change in the Angle of Subduction on the West

question 20

Multiple Choice

A change in the angle of subduction on the west coast of North America during Cretaceous resulted in

• A) subduction of the Franciscan complex and associated igneous activity.
• B) igneous activity in Nevada and Idaho.
• C) Sierra Nevada volcanism.
• D) decreased rates of westward movement of the North American plate.

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Definitions:

Mean

The arithmetic average of a set of numbers, calculated by dividing the sum of the numbers by the count of numbers in the set.

T Score

A type of standardized score that indicates how many standard deviations an element is from the mean.

Standard Deviation

A measure of the dispersion or spread in a set of data; it quantifies how much the individual data points differ from the mean value.

Mean

The average of a set of numbers, calculated by adding them together and dividing by the count of numbers.