Why do scientists place GPS receivers near a volcano?(1 point)

Question

Responses

to see which parts of the volcano’s surface are moving
to see which parts of the volcano’s surface are moving

to identify the likely course of pyroclastic flows or lahars
to identify the likely course of pyroclastic flows or lahars

to determine the amount of magma inside a volcano
to determine the amount of magma inside a volcano

to detect the presence of certain gases from the volcano

Answer 1

to detect the presence of certain gases from the volcano