What are the three most important phenomena that geologists routinely monitor on an active volcano? Ground deformation, smoke, and ground temperature. Weather, volcano temperature, and smoke. Ground color, smoke, and ground vibration Ground deformation, gas, and ground vibration.

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The three most important phenomena that geologists routinely monitor on an active volcano are:

1. **Ground deformation**: This refers to changes in the shape of the volcano, which can indicate magma movement beneath the surface. Monitoring ground deformation helps predict eruptions.

2. **Gas emissions**: The release of volcanic gases, such as sulfur dioxide, can provide insights into the volcanic activity and potential eruptions. Changes in gas composition and quantity can signal changes in the magma system.

3. **Ground vibration**: Seismic activity is closely monitored as it can indicate movement of magma and potential eruptions. Earthquakes and tremors are often precursors to volcanic eruptions.

Therefore, the correct answer is **Ground deformation, gas, and ground vibration.**
The three most important phenomena geologists monitor on an active volcano are ground deformation, gas emissions, and ground vibration.

What are the three most important phenomena that geologists routinely monitor on an active volcano? Ground deformation, smoke, and ground temperature. Weather, volcano temperature, and smoke. Ground color, smoke, and ground vibration Ground deformation, gas, and ground vibration.

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