Ageologist finds rocks with dinosaur fossils.
what is most likely the approximate age of the rocks?
a.
1 thousand years old
b.
500 million years old
c.
70 million years old
d.
5 billion years old

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