The ________ of a radioactive material is the time it takes for a given amount of radioactive isotope to be reduced by half.
A. half-life
B. atomic mass life
C. nuclear magnetic life
D. atomic life
E. atomic spin life
Answer: A
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Why don't fish have spines like the foraminifera to keep them from sinking?
a) The drag would use up too much energy in swimming. b) The fish is too heavy, so the drag would not slow its sinking by much. c) The drag would hinder the fish from catching prey. d) Fish don't need the extra surface area of spines to keep them buoyant due to their internal and external structure. e) A, B, and C
The main physical area of New Zealand consists of two main islands separated from Australia's southeastern region by the _________________.
Fill in the blank(s) with the appropriate word(s).
Which method of movement is most important to glaciers?
a. glacial retreat b. plastic flow c. isostatic rebound d. incremental advancement e. creep
Which type of rock flanks Lake Superior?
A) shale B) evaporite sedimentary rock C) volcanic and sedimentary rock D) metamorphic rock