Question

Match the following warning sign with its appropriate monitoring instrument.

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.