What are some hazards of the volcanic eruption that the people of Iceland (Divergent Boundary Volcano) OR Hawaii (Hot Spot Volcano) need to be aware of for their survival based on the current and past eruptions of that volcano?

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed