Scientists noticed that certain changes tend to happen around volcanoes in the days right before an eruption. They monitor these factors to determine how likely an eruption is in the near future.
Which two factors would best indicate that an eruption is more likely to happen in the near future?
A increased tectonic activity in the area
B. increased water vapor in the atmosphere
C. swelling of the ground around the volcano
D. eruption of another volcano on the same tectonic plate
E. a sudden change in weather in the area around the volcano