Directions: Tell whether the following refers to active fault or inactive fault. Write your answer on your answer sheet. 1. A fault that may still occur in the future. 2. A break that has never displayed any seismic activities for more than 10,000 years. 3. Areas along which all shallow earthquakes occur.
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Answer:
1. A fault that may still occur in the future.
Ans: An active fault
Explanation: An active fault is a fault that is likely to become the source of another earthquake sometime in the future.
2. A break that has never displayed any seismic activities for more than 10,000 years.
Ans: Inactive Fault
Explanation: Inactive faults are structures that we can identify, but which do no have earthquakes. As you can imagine, because of the complexity of earthquake activity, judging a fault to be inactive can be tricky, but often we can measure the last time substantial offset occurred across a fault.
3. Areas along which all shallow earthquakes occur.
Ans: Earthquakes and plate tectonics.
Explanation: Earthquakes occur at the following three kinds of plate boundary: ocean ridges where the plates are pulled apart, margins where the plates scrape past one another, and margins where one plate is thrust under the other.
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