The asthenosphere ________.

A) exists below a depth of 100 kilometers
B) is a subdivision of the outer core
C) exists below a depth of 700 kilometers
D) is a zone of strong mater


A) exists below a depth of 100 kilometers

A subdivision of the mantle situated below the lithosphere. This zone of weak material exists below a depth of about 100 kilometers and in some regions extends as deep as 700 kilometers. The rock within this zone is easily deformed.

Environmental & Atmospheric Sciences

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A) porous, permeable B) nonporous, nonpermeable C) porous, nonpermeable D) nonporous, permeable E) fertile, red in color

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Indicate whether the statement is true or false

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Approximately how many years ago did our species, Homo sapiens, begin to migrate out of Africa and settle in Europe, Asia, and Australia?

A) 100 million years B) 100,000 years C) 1,000 years D) 1 million years E) 10,000 years

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Sustainable development differs from traditional economic development in that it emphasizes economic development in the

A. Past B. Present and past C. Short term D. Long term E. Present

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