How many people did approximately get killed by volcanic eruptions since 1700?
How can volcanic ashes create dangers?
Which gas is heavier than air and can accumulate in volcanic lakes?
Which gas can react with water to form sulfuric acid?
Which indicators are often measurable before an eruption?
How many volcanic eruptions happen every year worldwide?
What shall I do if a volcano is giving signs of an imminent eruption while I am in the region?