What are the everglades?
a) an area of rocky soil and steep slopes
b) an area where farmers grow cotton
c) a temperate grassland
d) a large swampland area covered with tall grass

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