How much of the ocean's primary productivity is generated by seaweeds?
a. Between 1% and 5%
b. Between 5% and 10%
c. Between 10% and 12%
d. Between 12% and 15%
e. Less than 1%
a
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Contact metamorphism ____
A)is principally the result of high differential pressures B)produces basalt and gabbro C)is associated with mountain-building episodes D)is also known as thermal metamorphism E)occurs within a large area
Which of the following is an important source area for U.S. folk house types?
A) Lower Chesapeake B) Southern Atlantic C) Northeast D) Upper New York E) Southwest
Which of the following plate boundaries are considered to be "destructive?"
a. divergent b. occluded c. convergent (colliding) d. transform
Which of the following best describes the ozone hole?
A. It is a region of complete vacuum in the ozone layer B. It is a region where ozone sinks to the troposphere C. It is an actual hole in the ozone layer D. It is a region of reduced thickness in the ozone layer