What Mechanism Is Proposed for Cretaceous Subsidence of the Canadian

question 48

Multiple Choice

What mechanism is proposed for Cretaceous subsidence of the Canadian and American prairies?

• A) A subducting slab detaches from the trailing lithosphere, creating a downward flow that drags the base of the overriding continent with it.
• B) An underlying mantle plume suddenly quit, cooled, and subsided.
• C) A former broad monocline under the prairies eventually flattened out.
• D) A large Cretaceous meteorite impacted the prairies, the evidence for which has yet to be found.

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Definitions:

Progeny

The offspring or descendants of an organism.

Genotype

The genetic constitution of an organism, determining its specific traits and potential offspring characteristics.

Albinism

A group of genetic disorders characterized by little or no production of the pigment melanin, affecting the color of the skin, hair, and eyes.

Human Karyotype

is the complete set of all the chromosomes in a human cell, typically presented as 23 pairs including one pair of sex chromosomes.