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C. ENGAGEMENT (Pakikipagpalihan) Write TRUE if the following statements are commonly observed signs that a volcano is about to erupt and FALSET otherwise 1. Increase in the frequency of volcanic quakes with rumbling sounds, occurrence of volcanic tremore, 2. Increased steaming activity; change in color of steam emission from white to gray due to entrained ash. 3. Crater glow due to presence of magma at or near the crater. 4. Ground swells (or inflation), ground tilt and ground fissuring due to magma intrusion. 5. Localized landslides, rock falls and landslides from the summit area which attributable to heavy rains. 6. Noticeable decrease in the extent of drying up of vegetation around the volcano's upper slopes 7. Decrease in the temperature of hot springs, wells and crater lake (e.g. Taal near the volcano). 8. Noticeable variation in the chemical content of springs, crater lakes within the vicinity of the volcano. 9. Drying up of springs/wells around the volcano. 10. Development of new thermal areas and/or reactivation of old ones; appearance of solfataras (a volcanic crater emitting only sulfurous and other gases).
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