Answered

It uses special instruments to detect and measure changes in electromagnetic field due to magma activity.

a. Radioactivity
b. Seismic monitoring
c. Geophysical technique
d. Carbon dating​

Sagot :

Wilfredangelo14viz

Answer:

A.radioactivit

I hope it helps

Kloudeviz

Answer:

c. Geophysical technique

Explanation:

geophysical technique uses special instruments to measure changes in electromagnetic field due to magma activty, it also measure physical phenomena of the earth such as gravity, magnetism, elastic waves, electrical and electromagnetic waves.

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