Oceanic plateaus form from basaltic volcanism originating from
A. mid-ocean ridges.
B. trenches.
C. hot spots.
Answer: C
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A crustal block bounded by faults whose geologic history is distinct from the histories of adjoining crustal blocks is called a(n) ________
A) dome B) orogenic belt C) continental volcanic arc D) terrane
Is the volume of voids or open space in a rock or unconsolidated material.
A) Space yield B) Saturation index C) Permeability D) Porosity
How is ocean acidification possibly linked to increased anthropogenic emissions of carbon dioxide (CO2 )?
A) Atmospheric CO2 combines with atmospheric moisture forming a light carbonic acid forms (H2CO3 ), that is precipitated over the world's oceans. B) Increased photosynthetic activity in phytoplankton resulting from increased atmospheric CO2 concentrations results in acidification due to a complex chemical reaction during plant decay. C) Oceans may absorb much of the rising concentrations of rising carbon, as dissolved CO2 mixes with water to form carbonic acid (H2CO3). D) Thermohaline circulation exchanges carbon between surface dissolved organic carbon and deep layers of dissolved inorganic carbon.
The region of the U.S. that uses the most water for irrigation is
A. the northwestern states (west of the Mississippi River and north of 40°N latitude). B. the northeastern states (east of the Mississippi River and north of the Ohio River). C. the southwestern states including southern California (west of the Mississippi River and south of 40°N latitude). D. the southeastern states (east of the Mississippi River and south of the Ohio River).