How do the population densities of La Paz and Lima compare?​

Which of the following describes what rocks usually are composed of ,

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

Write a 150word essay describing the effect of people's activities on the environment in the region.