Physical Setting - Science Worksheet Page 11
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28Base your answers to questions 38 through 40 on the diagram below and on your knowledge of Earth
science. The diagram represents a cut-away view of Earth’s interior and the paths of some of the seismic waves
produced by an earthquake that originated below Earth’s surface. Points A, B, and C represent seismic stations
on Earth’s surface. Point D represents a location at the boundary between the core and the mantle.
Crust
Epicenter
P- and
S-waves
A
received at
seismic stations
Core
Mantle
B
No waves
received
D
Key
P-waves
C
S-waves
Only P-waves
received
38 Seismic station A is 5000 kilometers from the epicenter. What is the difference between the arrival time of
the first P-wave and the arrival time of the first S-wave recorded at this station?
(1) 2 minutes 20 seconds
(3) 8 minutes 20 seconds
(2) 6 minutes 40 seconds
(4) 15 minutes 00 second
39 Which process prevented P-waves from arriving at seismic station B?
(1) refraction
(3) convection
(2) reflection
(4) conduction
40 Only P-waves were recorded at seismic station C because P-waves travel
(1) only through Earth’s interior, and S-waves travel only on Earth’s surface
(2) fast enough to penetrate the core, and S-waves travel too slowly
(3) through iron and nickel, while S-waves cannot
(4) through liquids, while S-waves cannot
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[OVER]
P.S./E. Sci.–Aug. ’15
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