Why can seawater hold many times more carbon dioxide than either nitrogen or oxygen at saturation?
a. Carbon dioxide is not used in photosynthesis.
b. Carbon dioxide is used in mineral formation.
c. Carbon dioxide combines chemically with water to form carbonic acid.
d. Carbon dioxide is more reactive.
e. Carbon dioxide is used by plankton for energy
c
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For a given wavelength, diffraction is more pronounced for
A. small openings. B. wide openings. C. either of these D. none of the above
A sandstone is found to overlie a shale. The shale contains a volcanic ash layer that has been radiometrically dated to 84 million years ago. Both the shale and the sandstone are cut by a pluton of gabbro that has been dated to 60 million years old
How old is the sandstone layer? A) between 84 and 60 million years old B) older than 84 millions years old C) younger than 60 million years old D) more information is needed to constrain the age
Which countries are at the highest risk for major earthquakes?
a. those along the east coast of South America? b. ?those near the Arctic Circle c. ?those in southern Europe d. ?those along the east coast of North America e. ?those in the sub-African interior
A lava flow is an example of an effusive volcanic eruption
Indicate whether the statement is true or false