The Following Questions Refer to the Description and Figure Below

question 64

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 dashed horizontal arrows indicate the direction of sea-floor spreading, away from the rift valley.
Figure 25.1
-An early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to

• A)make life on land difficult for aerobic organisms.
• B)change the atmosphere from oxidizing to reducing.
• C)make it easier to maintain reduced molecules.
• D)cause iron in ocean water and terrestrial rocks to rust (oxidize).
• E)prevent the formation of an ozone layer.

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