Question Which of these factors contribute to the formation of lahars during or shortly after volcanic eruptions? [select 2] a. The volcanic eruption cloud reaches the stratosphere b. The volcanic eruption takes place during a drought c. The volcanic eruption takes place on a volcano with a substantial glacial or snow cover d. The volcanic eruption takes place during a typhoon or hurricane Which of the following may be signs of unrest at a dormant volcano? [select all that apply] a. Surface deformation (e.g., bulging, cracking) b. Changes in precipitation (rainfall) on the volcano c. Changes in the tilt angle of the surface d. Changes in the chemistry or amount of gas emitted by the volcano e. Changes in earthquake activity
Question
Which of these factors contribute to the formation of lahars during or shortly after volcanic eruptions? [select
2]
| a. | The volcanic eruption cloud reaches the stratosphere |
| b. | The volcanic eruption takes place during a drought |
| c. | The volcanic eruption takes place on a volcano with a substantial glacial or snow cover |
| d. | The volcanic eruption takes place during a typhoon or hurricane |
Which of the following may be signs of unrest at a dormant volcano? [select all that apply]
| a. | Surface deformation (e.g., bulging, cracking) |
| b. | Changes in precipitation (rainfall) on the volcano |
| c. | Changes in the tilt angle of the surface |
| d. | Changes in the chemistry or amount of gas emitted by the volcano |
| e. | Changes in earthquake activity |
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