A feedback mechanism occurs when the environment initially changes slowly or not at all in response to a small perturbation, but after the threshold is crossed, an additional small perturbation causes rapid and dramatic change.
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Q45: The hydrosphere includes water in streams, lakes,
Q46: Ground water accounts for 71 percent of
Q47: Oceans cover about 71 percent of the
Q48: The Earth's core is composed of hot,
Q49: More water exists in the Earth's atmosphere
Q51: The Earth's mantle lies over the core,
Q52: The biosphere consists solely of the thin
Q53: Gradualism states that:
A) the Earth is uniform
Q54: The Earth is about 460 million years
Q55: At its center, Earth is as hot
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