A seismic station records an earthquake that has a maximum surface wave amplitude of 50 mm and the S-wave arrives 2 seconds after the P-wave. The Richter magnitude of this earthquake is
A) 3.
B) 4.
C) 5.
D) 6.
Answer: A
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In a mature forest in a national park, maple trees grow very large and live more than 80 years. Over an average lifetime, a tree produces more than 100,000 seeds, of which only 2 to 3 sprout and grow to maturity. This maple tree is
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A. randomly all around B. east of C. along D. west of
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Indicate whether the statement is true or false