An impending volcanic eruption causes ground swelling, ground tilting, and ground fissuring due to _______. 

_____ glow due to the presence of magma at or near the crater.

Signs of impending volcanic eruption are the development of new thermal areas and/or reactivation of old ones; the appearance of ______.

There can be an increased steaming activity before a volcano erupts and the steam emission’s color changes from ________. 

Increase in the frequency of volcanic quakes with rumbling sounds; the occurrence of volcanic ______.

There is a noticeable increase in the extent of drying up vegetation around the volcano’s upper slopes.

There is a decrease in the temperature of hot springs near the volcano.

Drying up of springs/wells around the volcano.

Noticeable variation in the chemical content of springs, crater lakes within the vicinity of the volcano.

Localized landslides, rockfalls, and landslides from the summit area which are attributable to heavy rains.