Question

Volcanic eruptions are often predictable several days or weeks in advance. Which of the following changes would likely indicate a possibility for a volcanic eruption? (choose 3)
Responses
A Increased gas and heat emissions from surrounding ventsIncreased gas and heat emissions from surrounding vents
B Daily decreasing air pressure around the volcanoDaily decreasing air pressure around the volcano
C Increased small earthquakes in the areaIncreased small earthquakes in the area
D Slight swelling of the volcanoSlight swelling of the volcano
E Increased humidity near the peak of the volcano

Answer 1

The three changes that would likely indicate a possibility for a volcanic eruption are:

A. Increased gas and heat emissions from surrounding vents
C. Increased small earthquakes in the area
D. Slight swelling of the volcano

These indicators suggest that magma is likely moving closer to the surface, which can lead to an eruption.