The Following Questions Refer to the Description and Figure Below

question 41

Multiple Choice

The following questions refer to the description and figure below.
The figure represents a cross section of the sea floor through a mid-ocean rift valley, with alternating patches of black and white indicating sea floor with reversed magnetic polarities. At the arrow labeled "I" (the rift valley) , the igneous rock of the sea floor is so young that it can be accurately dated using carbon-14 dating. At the arrow labeled "III," however, the igneous rock is about 1 million years old, and potassium-40 dating is typically used to date such rocks. Note: The horizontal arrows indicate the direction of sea-floor spreading, away from the rift valley.

Figure 25.1
-Which section of sea-floor crust should have the thickest layer of overlying sediment, assuming a continuous rate of sediment deposition?

• A) A
• B) B
• C) C
• D) D
• E) E

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Definitions:

Ischemia

Decreased blood supply to a body part such as skin tissue or to an organ such as the heart.

Pulse Oximetry

A noninvasive method used to measure the oxygen saturation level of the blood.

Suctioning

The process of removing obstructions, such as mucus or secretions, from the airway by negative pressure.

Oxygen Saturation

The measurement of the percentage of oxygen bound to hemoglobin in the blood, indicating the efficiency of oxygen transport.