Question

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what data do scientists use to determine when a volcano might erupt?

Explanation:

Scientists use seismic activity (earthquakes), ground deformation (measured by GPS and tilt - meters), gas emissions (such as sulfur dioxide levels), and changes in the volcano's magnetic and electrical properties. These data can indicate magma movement and pressure build - up inside the volcano.

Answer:

Seismic activity, ground deformation, gas emissions, and changes in magnetic/electrical properties.