Which describes uniformitarianism?
a. the rates of geologic change increase with time
b. geologic processes are different over time
c. the rates of geologic processes slow down with time
d. geologic processes operating now are the same as those that operated in the past

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