Which of the following would be an example of "popular culture"? a large heterogeneous group in an urban area
a group living in a rural area
a small homogeneous cultural group
an Amish settlement in the Midwest
groups that have little interaction

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