Which statement best explains the economic benefit of using geothermal energy over energy generated by fossil fuels?

Less pollution than fossil fuel plants

More energy plant locations available

More cost-effective over time

Lower installation costs than fossil fuel plants

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