Geologists prefer to use rocks from closed systems when they radiometrically date the rocks. What is a closed system,
and why is it important for radiometric dating? What will be an ideal response?
Rocks from a closed system have not been altered by erosion, weathering, metamorphism, or
any other geologic process since their formation. In a closed system, no parent or daughter
isotopes may leave, so the parent/daughter isotope ratio remains the same. Any leakage could
affect the parent/daughter ratio, introducing error into dating calculations.
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Steam fogs and frontal fogs are both types of ________ fogs
Fill in the blank(s) with correct word
Oxisols have a ________ cation-exchange and, therefore, ________ fertility
A) high; high B) low; high C) low; low D) high; low
Infectious disease accounts for ________% of deaths globally
A) less than 1 B) almost 17 C) almost 50 D) almost 64 E) almost 79
What did the Cassini spacecraft and its Huygens probe discover on the surface of Titan, the largest of Saturn's moons?
A. Networks of drainages were apparently carved by liquids. B. The surface was nearly completely covered by impact craters. C. There was a large impact crater that nearly blasted the moon apart. D. None of these choices are correct.