After a threshold is crossed, the landscape
A. remains unstable thereafter.
B. adjusts to a new equilibrium condition.
C. looks identical to the landscape that existed prior to the crossing of the threshold.
D. Any of the above are equally likely to occur.
Answer: B. adjusts to a new equilibrium condition.
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Slices of ancient oceanic crust, tectonically emplaced onto the continents, are called
a. turbidites. d. layered intrusions. b. ophiolites. e. none of the above c. ultramafics.
Mountain building in western North America did not begin until the Late Cretaceous Period. Indicate whether the statement is true or false
Someone has offered you shares in a sure-shot wildcat oil-drilling venture in the Sierra Nevada of
California. Which of the following is the most important reason you should reject his shady offer? a. The Sierra Nevada is composed of granitic and metamorphic rocks. b. There is no prior oil or gas production in California. c. Drilling is prohibited in the entire Sierra Nevada because it is all national forest. d. Oil and gas production only occurs at present day plate boundaries. e. Movement along the San Andreas fault has caused all existing oil to leak to the surface.
Why has environmentalism become such a widespread concern worldwide?
a. Democratic sensibilities and institutions b. Moral attractiveness of nature c. Spread of knowledge of material threats to the environment d. All of the above