Indicate the possible sequences of events before and after an earthquake.
Earthquakes
1. Every year earthquakes are responsible for a large number of deaths and a vast amount of destruction in various parts of the world. Most of these damaging earthquakes occur either in a narrow belt which surrounds the Pacific Ocean or in a line which extends from Burma to the Alps in Europe. Some of the destruction is directly caused by the quake itself. An example of this is the collapse of buildings as a result of vibration. Other damage results from landslides, tsunamis (large ocean waves) or major fires which are initiated by the quake.
2. There are about a million quakes a year. Fortunately, however, not all of-them are destructive. The intensity of an earthquake is measured on the Richter Scale, which goes from 0 upward. The highest magnitude recorded to date is 8.9. Major damage generally occurs from quakes ranging upwards from 6.0. Exceptions to this are those whose epicentres are located far from inhabited areas.
4. In order to minimize the damage and to alleviate some of the suffering resulting from earthquakes, scientists are working on ways to enable accurate prediction. Two of the instruments presently in use to achieve this goal are seismographs and tiltmeters. The former records any shaking of the earth; by means of calculations seismologists can accurately indicate the exact time, location and size of an earthquake. The latter, as the name suggests, is used to record any changes in the tilt of the land.
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Question Focus: Cause before an earthquake - reasons for pressure
Correct Answer: expansion and contraction
Why this is correct: The diagram shows events leading up to an earthquake. The passage explains that pressure is caused by several reasons, including expansion and contraction of the earth's crust. This fits the first box showing an early cause.
Passage Reference: This is produced by pressure which scientists believe may be due to a number of reasons, two of which are the expansion and contraction of the earth's crust and continental drift.
Common Mistake: Students sometimes write continental drift because it appears nearby in the passage. That is only one of the reasons and does not match the diagram position. This is a partial truth trap.
Paraphrasing: Passage: 'the expansion and contraction of the earth's crust' = Diagram: 'early cause before pressure builds'
Tips: For diagrams, check the sequence carefully. Earlier boxes usually describe causes, not results.
Key Vocabulary:
- expansion = getting bigger
- contraction = getting smaller
Question Focus: Immediate cause leading to the earthquake
Correct Answer: pressure
Passage Reference: This is produced by pressure which scientists believe may be due to a number of reasons, two of which are the expansion and contraction of the earth's crust and continental drift.
Why this is correct: The diagram shows something building up before rocks break. The passage clearly states that the rupturing of rocks is produced by pressure, so this fits the second box.
Common Mistake: Some students write stress or force, but these words do not appear in the passage. You must copy the exact word. This is a synonym trap.
Paraphrasing: Passage: 'produced by pressure' = Diagram: 'build-up before rupture'
Tips: Never replace a passage word with your own synonym in FIB questions.
Key Vocabulary:
- pressure = strong force pushing
Question Focus: The earthquake event itself
Correct Answer: rupturing of rocks
Passage Reference: The actual cause of the quake itself is the rupturing or breaking of rocks at or below the earth's surface.
Why this is correct: The diagram box represents the earthquake itself. The passage says the quake is caused by the rupturing or breaking of rocks, so rupturing of rocks matches exactly.
Common Mistake: Students sometimes write earthquake itself, but the passage explains the cause, not just the name. This is a context shift trap.
Paraphrasing: Passage: 'rupturing or breaking of rocks' = Diagram: 'earthquake occurs'
Tips: If the diagram asks for a process, look for action words in the passage.
Key Vocabulary:
- rupturing = breaking suddenly
Question Focus: Direct damage after an earthquake
Correct Answer: collapse of buildings
Passage Reference: An example of this is the collapse of buildings as a result of vibration.
Why this is correct: After the earthquake, the diagram shows types of damage. The passage gives collapse of buildings as a direct result of vibration, so this fits the first damage box.
Common Mistake: Some students write destruction of buildings, but those exact words are not used. This is a synonym trap.
Paraphrasing: Passage: 'collapse of buildings' = Diagram: 'direct damage after quake'
Tips: For damage effects, copy the example phrases exactly from the passage.
Key Vocabulary:
- collapse = fall down
Question Focus: Secondary damage after an earthquake
Correct Answer: landslides
Passage Reference: Other damage results from landslides, tsunamis (large ocean waves) or major fires which are initiated by the quake. 2.
Why this is correct: The diagram lists several types of damage after the quake. The passage says other damage results from landslides, which matches one of these boxes.
Common Mistake: Students sometimes write land sliding, which changes the form. You must copy the exact word. This is a grammar form trap.
Paraphrasing: Passage: 'damage results from landslides' = Diagram: 'after-effects of earthquake'
Tips: Check singular or plural carefully when copying nouns.
Key Vocabulary:
- landslide = earth moving down a hill
Question Focus: Ocean-related damage after an earthquake
Correct Answer: tsunamis
Passage Reference: Other damage results from landslides, tsunamis (large ocean waves) or major fires which are initiated by the quake. 2.
Why this is correct: The diagram includes damage affecting the sea. The passage lists tsunamis as one of the results of earthquakes, so this fits exactly.
Common Mistake: Some students write large ocean waves, but that is only an explanation in brackets. The answer must be tsunamis. This is a paraphrase trap.
Paraphrasing: Passage: 'tsunamis (large ocean waves)' = Diagram: 'sea-related damage'
Tips: Prefer the technical term if it appears in the passage.
Key Vocabulary:
- tsunami = very large sea wave
Question Focus: Fire-related damage after an earthquake
Correct Answer: major fires
Passage Reference: Other damage results from landslides, tsunamis (large ocean waves) or major fires which are initiated by the quake. 2.
Why this is correct: The final box shows another type of destruction. The passage clearly includes major fires as damage initiated by the quake, so this completes the sequence.
Common Mistake: Students sometimes write fires only, but the passage specifies major fires. Missing the adjective makes it incomplete. This is a partial truth trap.
Paraphrasing: Passage: 'major fires which are initiated by the quake' = Diagram: 'fire damage after earthquake'
Tips: Do not drop adjectives if they are part of the passage answer.
Key Vocabulary:
- major = very large or serious
General Tips:
- For diagram completion, follow the sequence carefully. Causes come before effects.
- Always copy the exact words from the passage. Do not change form or use synonyms.
- Check the word limit every time. Even one extra word makes the answer wrong.
- Look for lists in the passage. Diagrams often turn lists into separate boxes.
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