How is the distance to the epicenter of an earthquake determined using a seismograph?
a. How hard the seismograph needle swings back and forth is noted.
b. Travel time is clocked and then compared to the reported time of the earthquake at the
epicenter.
c. The arrival times of surface waves are noted.
d. The delay time between the P-wave and the slower S-wave is considered.
e. You cannot do this with a single seismograph
D
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A. iron B. silica C. urea D. phosphorus
?Why can the reserves of a mineral change in size even if no deposits are discovered or depleted?
Fill in the blank(s) with the appropriate word(s).
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