Irreversible changes in ecological systems caused by human activities that result in large scale environmental changes are causing those systems to experience an ecological __________ point.

Fill in the blank(s) with the appropriate word(s).


tipping

Environmental & Atmospheric Sciences

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If Uranium-234 decays via alpha emission, what is the likely product of radioactive decay? (U, atomic no. = 92)

A) Th B) Np C) Th D) Np E) none of the above

Environmental & Atmospheric Sciences

A large person and a small person wish to parachute at equal terminal velocities. The larger person will have to

A) get a larger parachute. B) jump lightly. C) pull upward on the supporting strands to decrease the downward net force. D) jump first from the plane. E) none of the above

Environmental & Atmospheric Sciences

Which of the following is not a characteristic of quartz?

A) hardness of 7 B) commonly occurs in six-sided crystals C) one direction of cleavage D) conchoidal fracture E) made up of SiO2

Environmental & Atmospheric Sciences

Although the global ocean is a single and continuous body of water, geographers divide it into five large areas-the Atlantic, Pacific, Indian, ____, and Southern Oceans-separated by the continents.

A. Mediterranean B. Adriatic C. Arctic D. Baltic E. Aegean

Environmental & Atmospheric Sciences