Most oceanic islands and seamounts are
A. small pieces rifted apart from continents.
B. places where the seafloor has been buckled upward by convergence.
C. large fan-shaped mounds deposited by turbidity currents.
D. constructed by volcanic eruptions that first occur under water.
Answer: D
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Wetland soils may serve a water-purification role.
Answer the following statement true (T) or false (F)
Illustrate the difference between the closest point sampling method and the quadrant sampling method by using a sample size of 12.
What will be an ideal response?
Which of the following might be considered a viable application of a radioactive tracer?
A) adding a stream of radioisotopes to waste water to examine where pollution goes when it flows into the ocean B) placing radioactive sources around a room to trace the location of people as they move through the room C) embedding a radioactive plug in a valuable necklace so that its location can be determined using a Geiger counter D) all of the above E) none of the above
According to this hypothesis, early modern humans established separate populations throughout
Eurasia, and had occasional interbreeding between populations:a. Eurasian origination hypothesis b. migrational hypotheses c. multiregional hypothesis d. out of Africa hypothesis e. tandem evolution hypothesis