What evidence is NOT used by scientists to decide whether a stratovolcano may be getting ready to erupt?
A) whether there are changes in the temperatures of volcanoes and erupted steam
B) whether numerous microearthquakes are occurring
C) whether a large bulge is growing on the flank of the volcano
D) whether there is an increase in sulfur oxide gas emissions from the volcano
E) whether red-hot molten magma is visible when looking down the crater

Question

Quizplus · Accepted Answer

Scientists do not use the visible presence of red-hot molten magma as evidence to determine whether a stratovolcano may be getting ready to erupt. This is because the magma may be contained within the volcano and not necessarily indicative of an imminent eruption. Other factors such as gas emissions, seismic activity, and deformation of the volcano's surface are more reliable indicators.

What Evidence Is NOT Used by Scientists to Decide Whether