An iron rod will become magnetic when
A. its atoms are aligned.
B. opposite ions accumulate at each end.
C. its electrons stop moving and point in the same direction.
D. the net spins of many internal electrons are aligned.
Answer: D
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a. tornado b. hurricane c. middle-latitude cyclone d. water spout
The local illumination condition in a hillshade view can be influenced by
A. sun's angle B. local slope C. local aspect D. all of these are correct
Historical geology is the study of ____________________. Fill in the blank(s) with the appropriate word(s)