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Measure earthquakes and reduce their risks

7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-ESS3-2, NGSS.SEP 5 · England: KS3 Chemistry: Earth and atmosphere, KS3 Geography: Natural hazards

Name

Date

Score/ 16

1
Question 1
Some countries send phone alerts seconds before strong shaking arrives. How is this possible?
- A. They predict quakes days ahead
- B. Phones feel the earthquake first
- C. Radio waves are slower than seismic waves
- D. Sensors detect the faster, weaker first waves and send warnings before slower damaging waves arrive
Question 2
On the magnitude scale, each whole number up means the ground shaking (wave amplitude) is 10 times larger. How many times larger is the shaking in a magnitude 7 earthquake than in a magnitude 4?
Answer
3
Question 3
Earthquakes: which statement is NOT true?
- A. Each step up in magnitude releases about 32 times more energy.
- B. The point on the surface above an earthquake's origin is the epicentre.
- C. Most earthquakes happen near plate boundaries.
- D. Earthquakes only happen in hot countries.
4
Question 4
Why can scientists not predict the exact time of an earthquake?
- A. Stress builds up unpredictably along faults, so only long-term probabilities can be given
- B. Earthquakes are random and have no causes
- C. Seismometers do not work
- D. Earthquakes only happen at night
Question 5
On the magnitude scale, each whole number up means the ground shaking (wave amplitude) is 10 times larger. How many times larger is the shaking in a magnitude 4 earthquake than in a magnitude 3?
Answer
6
Question 6
Earthquakes: which statement is NOT true?
- A. Each step up in magnitude releases about 32 times more energy.
- B. The point on the surface above an earthquake's origin is the epicentre.
- C. Most earthquakes happen near plate boundaries.
- D. Earthquakes only happen in hot countries.
7
Question 7
Why can scientists not predict the exact time of an earthquake?
- A. Stress builds up unpredictably along faults, so only long-term probabilities can be given
- B. Earthquakes only happen at night
- C. Seismometers do not work
- D. Earthquakes are random and have no causes
Question 8
On the magnitude scale, each whole number up means the ground shaking (wave amplitude) is 10 times larger. How many times larger is the shaking in a magnitude 7 earthquake than in a magnitude 5?
Answer
9
Question 9
Earthquakes: which statement is NOT true?
- A. Each step up in magnitude releases about 32 times more energy.
- B. The point on the surface above an earthquake's origin is the epicentre.
- C. Most earthquakes happen near plate boundaries.
- D. Earthquakes only happen in hot countries.
10
Question 10
Why can scientists not predict the exact time of an earthquake?
- A. Earthquakes are random and have no causes
- B. Earthquakes only happen at night
- C. Seismometers do not work
- D. Stress builds up unpredictably along faults, so only long-term probabilities can be given
Question 11
On the magnitude scale, each whole number up means the ground shaking (wave amplitude) is 10 times larger. How many times larger is the shaking in a magnitude 7 earthquake than in a magnitude 4?
Answer
12
Question 12
Earthquakes: which statement is NOT true?
- A. The point on the surface above an earthquake's origin is the epicentre.
- B. A magnitude 6 earthquake is twice as strong as a magnitude 3.
- C. Undersea earthquakes can cause tsunamis.
- D. Each step up in magnitude releases about 32 times more energy.
13
Question 13
Some countries send phone alerts seconds before strong shaking arrives. How is this possible?
- A. Phones feel the earthquake first
- B. They predict quakes days ahead
- C. Sensors detect the faster, weaker first waves and send warnings before slower damaging waves arrive
- D. Radio waves are slower than seismic waves
Question 14
On the magnitude scale, each whole number up means the ground shaking (wave amplitude) is 10 times larger. How many times larger is the shaking in a magnitude 4 earthquake than in a magnitude 3?
Answer
15
Question 15
Earthquakes: which statement is NOT true?
- A. The point on the surface above an earthquake's origin is the epicentre.
- B. Undersea earthquakes can cause tsunamis.
- C. Most earthquakes happen near plate boundaries.
- D. Earthquakes only happen in hot countries.
16
Question 16
What instrument records earthquake waves?
- A. an anemometer
- B. a barometer
- C. a seismometer
- D. a thermometer

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Answer key: Measure earthquakes and reduce their risks

1. D. Sensors detect the faster, weaker first waves and send warnings before slower damaging waves arrive
2. 1000
3. D. Earthquakes only happen in hot countries.
4. A. Stress builds up unpredictably along faults, so only long-term probabilities can be given
5. 10
6. D. Earthquakes only happen in hot countries.
7. A. Stress builds up unpredictably along faults, so only long-term probabilities can be given
8. 100
9. D. Earthquakes only happen in hot countries.
10. D. Stress builds up unpredictably along faults, so only long-term probabilities can be given
11. 1000
12. B. A magnitude 6 earthquake is twice as strong as a magnitude 3.
13. C. Sensors detect the faster, weaker first waves and send warnings before slower damaging waves arrive
14. 10
15. D. Earthquakes only happen in hot countries.
16. C. a seismometer