Choose the letter of the correct answer and write on the space provided before each number. 1. Where does an earthquake originate? B. Focus A. Epicenter C. intensity D. Magnitude 2. What kind of volcanic eruption when there are large amount of pyroclastic are ejected by the volcano into the air? A. Quiet eruption B. Nonexplosive eruption C. Explosive eruption D. None of the above 3. Viici of the following event causes an earüinquake? A. Mixture of crustal plates B. Too much heat from the sun 4. What does PHIVOLCS mean? C. Movement of crustal plates D. Changing temperatures C. Philippine Institute of Volcanology and Seismology D. Philippine Institute of Volcanologists and Seismologists A. Philippine Institute of Volcanology B. Philippine Institute of Volcanologists 5. At what magnitude can an earthquake cause displacement of buildings and cracks on the earth's surface? 6. Magnitude 6 C. Magnitude 7 D. Magnitude ô A. Magnitude 5
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