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
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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
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
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
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