The Appalachian Mountains may have once been as lofty as the Himalayan-Tibetan Mountain belt is today. Why are they not this high now?
A) They formed long ago, and erosion has beveled them to their present low elevation.
B) They developed a dense crustal root following collision, and isostasy forced them to sink to their present elevation.
C) Opening of the North Atlantic Ocean converted lithosphere to asthenosphere beneath eastern North America, forcing eastern North America to sink to low elevations.
D) The mountains cooled following the collision, which increased the density of the of the rocks by cooling, and isostasy forced the mountains to sink.
A
You might also like to view...
Carbon moves from the abiotic world to the biotic world when
A) plants make glucose during photosynthesis. B) an animal consumes a plant. C) humans burn fossil fuels. D) bacteria convert it to ammonium.
A farmer is tired of watching crops die in the field from several pest species. She decides that next year she is going to use every type of ecological pest control she can find to address the problem
Over the winter she gets ready, ordering pheromones that interfere with the reproduction of the pests, sterile male flies that will try to reproduce with some of the pest flies, and wasps that lay their eggs in the larvae of another pest. It is expensive, but she thinks this should work well. Which of the following forms of control is she not using? A) Natural enemies control B) Cultural control C) Genetic control D) Natural chemical control
How many moles of solute are contained in 500. mL of 0.50 M KCl?
A) 0.25 B) 0.50 C) 1.0 D) 2.0
If you heat a jar with water in it, the amount of water vapor that will go into the air in order to reach saturation will ________
A) increase in amount B) decrease in amount C) raise the temperature of the water D) lower the temperature of the water E) Everything will stay the same.