Because of the tilt of the earth, a. not all places receive the same amount of light at one time. b. there is a lack of light at the equator at the winter solstice. c. the polar areas are dark for the entire summer. d. all of the above

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