Certain rock types can be used to determine the locations of past magnetic poles because ____.
a. the Earth's magnetic poles have reversed many times during its history
b. the magnetic poles and geographic poles differ slightly
c. iron-bearing minerals align themselves in the direction of the current magnetic field when the rock cools below the Curie point
d. lava flows in Europe all showed that the continent was once located in the southern hemisphere
e. the north magnetic poles of each continent are identical for each geological period
c. iron-bearing minerals align themselves in the direction of the current magnetic field when the rock cools below the Curie point
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When the Demographic Transition is complete, which of the following is true?
A) TFR = 2 B) doubling time = 1 C) doubling time = 0. D) RNI = 1 E) CBR = CDR
Misuse of land reduces its soil fertility and causes air- and water-quality problems.
Answer the following statement true (T) or false (F)
A model is a useful simplification of a more complex reality
a. True b. False Indicate whether the statement is true or false
The population of elk in Yellowstone
A) reflects top-down and bottom-up population regulation. B) has survived because of the elimination of keystone predator species. C) would have been more stable if there had only been one predator species. D) would be better off if all predators were eliminated from the park.