A rock sample containing an isotope with a half-life of 12 million years has an initial mass of 72 grams. How much of the parent isotope will be present after three half-lives?
A)4.5 grams
B)9 grams
C)18 grams
D)54 grams
E)63 grams
B
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Which of the following is true about the general geographic distribution of richness and equitability?
A) Both richness and equitability, and therefore biodiversity, increase from the tropics to the poles. B) Both richness and equitability, and therefore biodiversity, decrease from the tropics to the poles. C) Richness decreases from tropical areas to polar areas; equitability may increase toward the poles, but overall, biodiversity decreases from the tropics to the poles. D) Richness increases from tropical areas to polar areas; equitability may decrease toward the poles, but overall, biodiversity increases from the tropics to the poles.
A trough-shaped fold away from the fold axis is
A. plunging. B. tilted. C. called an anticline. D. called a syncline.
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Discuss the prospects of Iran becoming a greater political force in Southwest Asia and North Africa geopolitics
What will be an ideal response?