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1. When volcanoes erupt, they can eject a lava b. gases d. all of the above 2. Which of the following are signs of an impending volcanic eruption? a. Crater glow due to presence of magma at or near the crater b. Increase in the temperature of hot springs C. Increase in the frequency of volcanic quakes. d. All of the above. 3. When the status of an erupting volcano is Alert Level 2, this means that the volcano is in a quiet or no alert C increasing unrest b. low level of volcanic unrest d. magmatic unrest are large fragments with sizes ranging from that of a baseball, a basketball or more than one meter across. a. Volcanic dust C. rocks b. Volcanic ash d. volcanic bombs 5. Viscosity depends on three factors, EXCEPT a silica content of the lava. b. vapor pressure of magma. c. Temperature of the lava relative to the cooler temperature at which it solidifies d. gas dissolved in magma. 6. During an eruption, volcanic ash and other rock particles, called also escape violently into the air. a. tephra C. pyroclastic materials b. vesicles d. mudflow 7. It acts like raging waters, carrying away everything in its way such as bridges, buildings, houses, and vegetation. c. mudflow b. magma d. rock fragments 8. An hazardous eruption imminent/possible in days is Alert Level a. lava b. 3 d. 1 9. The government agency task with monitoring earthquakes and volcanoes in the country. a. DENR C. DOST b. PHIVOLCS d. DepEd. 10. During eruption, volcanic matcrial is a. blown to some meters b. blown to some inches e blown to many lilometers d. blown to some cet
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