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.

Environmental & Atmospheric Sciences

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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

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Slices of ancient oceanic crust, tectonically emplaced onto the continents, are called

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Mountain building in western North America did not begin until the Late Cretaceous Period. Indicate whether the statement is true or false

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