Which characteristic does not apply to trilobites?
a. abundant in modern oceans
b. excellent guide fossils
c. benthos, mobile
d. sediment-deposit feeder
e. invertebrate
a
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What is the main difficulty in trying to eliminate chlorinated fluorocarbons from the atmosphere?
A. They are very stable and take a long time to decompose completely. B. They do not absorb ultraviolet radiation. C. They are too light and blow away. D. all of the above E. only a and b
Is the rate of Earth's rotation increasing or decreasing?
A) It is increasing. B) It is decreasing. C) It is remaining relatively steady. D) It is increasing and decreasing in cyclic fashion.
Ice cores, such as the Vostok ice core, can be used to reconstruct temperature patterns indirectly, using ________.
A. oxygen isotopes of water in ice B. methane concentrations in gas bubbles C. dust content in ice D. carbon dioxide concentration in gas bubbles E. mercury concentrations in ice
A deposit of unconsolidated sediment that extends landward from low tide to a change in topography or to where permanent vegetation begins is a(n) ____
A)spit B)tombolo C)barrier island D)beach E)baymouth bar