From This Cross Section of the Grand Canyon,what Is the Boundary

question 149

Multiple Choice

From this cross section of the Grand Canyon,what is the boundary between the various Precambrian rocks and the Paleozoic sedimentary units?

• A)It is a depositional contact,probably representing only a short period of geologic time.
• B)It is an angular unconformity in most places and a nonconformity where it overlies granite.
• C)It generally is an unconformity and represents more time in the right part of the diagram than in the left part of the diagram.
• D)All of these are correct.

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Definitions:

Abscisic Acid

A plant hormone that regulates growth and development processes, including seed dormancy and response to environmental stress.

Seed Germination

The process by which a seed begins to grow and develops into a new plant, often triggered by water absorption and temperature.

Hormone

Chemical substances produced in the body that regulate the activity of cells or organs, essential for every function from growth and metabolism to reproduction.

Vernalization

A process involving the exposure of seeds or young plants to prolonged cold temperatures to induce flowering.