II. Put a check (/) on the blank if the statement is correct and (X) if it is incorrect. 1. Face mask is usually worn after a volcanic eruption. 2. One of the warning signals of a possible volcanic eruption is an earthquake. 3. Lahar is a hot molten or semifluid rock erupted from a volcano or fissure. 4. An ash fall contains rough particles and natural glass blasted into the air by a volcano. 5. PAG-ASA is government agency that studies and monitors the activities of volcanoes, earthquakes, tsunamis, and other related geotectonic phenomena.