In order to use a radioactive-decay scheme to calculate the age of a mineral all of the following conditions must be met except
A) the half-life must be known.
B) no daughter isotope present prior to the start of parental decay or the amount of daughter can be determined.
C) no parent or daughter isotopes can be gained or lost from the mineral once decay starts.
D) only one radioactive isotope can exist in the rock so that cross-decay doesn't occur.
Answer: D
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A) 6 km/s B) 40 km/s C) 56 km/s D) 384 km/s
National censuses reveal a drop in a nation's growth rate that occurs about 20 years before the number of persons added per year declined. This 20-year lag represents
A) new immigration policies that became law. B) a drop in the number of people reaching reproductive age. C) increased use of family planning techniques. D) social pressures to reduce family size.
The Gulf of Mexico's dead zone is caused by high levels of ____ in the Mississippi River.
A. coliform bacteria B. phytoplankton C. plant nutrients D. algae E. cyanobacteria
Explain why Wegner's use of shorelines to match continents in his reconstruction of Pangaea was criticized by other geoscientists and how that issue was subsequently resolved in Plate Tectonic Theory
What will be an ideal response?