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PES Skill Sheets.book - Capital High School

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Practice 2:<br />

1. First problem is done for students.<br />

Station A: t p = 128 seconds<br />

2. Station B:<br />

5 km/sec × t p = 3 km/sec × (t p + 80 sec)<br />

(2 km/sec) t p = 240 km<br />

t p = 120 seconds<br />

3. Station C: t p = 180 seconds<br />

4. Station A: distance = 5 km/s × 128 sec = 640 km<br />

Station B: distance = 5 km/s × 120 sec = 600 km<br />

Station C: distance = 5 km/s × 180 sec = 900 km<br />

5. Answers are:<br />

(a) 5 km/s × 200 s = 3 km/s × (200 s + x)<br />

1000 km = 600 km + (3 km/s)x<br />

400 km = (3 km/s)x<br />

x = 133 s = time between the P-waves and S-waves<br />

(b) 133 s + 200 s = 333 s = t s<br />

<strong>Skill</strong> Sheet 20.2: Volcano Parts<br />

A. Vent<br />

B. Layers of lava and ash<br />

C. Volcano<br />

D. Magma<br />

<strong>Skill</strong> Sheet 20.3: Basalt and Granite<br />

Sample student answer:<br />

<strong>Skill</strong> Sheet 21.2: Concentration of Solutions<br />

1. 6.7%<br />

2. 2.0%<br />

3. 0.6%<br />

4. 400 g salt<br />

5. 3.75 g sugar<br />

6. 139 g sand<br />

Page 46 of 57<br />

6. Table 3 answers:<br />

Variables Station 1 Station 2 Station 3<br />

Speed of P-waves rp 5 km/s 5 km/s 5 km/s<br />

Speed of S-waves r s 3 km/s 3 km/s 3 km/s<br />

Time between the<br />

arrival of P- and<br />

S-waves<br />

Total travel time of<br />

P-waves<br />

Total travel time of<br />

S-waves<br />

E. Conduit<br />

F. Magma chamber<br />

G. Vent<br />

H. Lava<br />

7. 43%<br />

8. 12.5 g<br />

9. 0.5%<br />

10. 8.8 g red food coloring<br />

t s –t p<br />

t p<br />

t s<br />

70<br />

seconds<br />

105<br />

seconds<br />

175<br />

seconds<br />

115<br />

seconds<br />

173<br />

seconds<br />

288<br />

seconds<br />

92<br />

seconds<br />

138<br />

seconds<br />

230<br />

seconds<br />

Distance to epicenter d p , d s 525 km 865 km 690 km<br />

Scale distance to<br />

epicenter<br />

2.6 cm 4.3 cm 3.5 cm

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