Match the following warning sign with its appropriate monitoring instrument.

Question

1. Volcano is emitting gases.
COSPEC
2. Small tremors are occurring.
tiltmeter
3. The ground by a volcano is moving upward.
seismograph

Answer 1

Here is the correct matching of warning signs with their appropriate monitoring instruments:

1. Volcano is emitting gases. - COSPEC
2. Small tremors are occurring. - seismograph
3. The ground by a volcano is moving upward. - tiltmeter

This matches the relevant monitoring instruments to the volcanic activities described.