Pad 3:17 PM 100%- HW4 SnowballEarth Circulation.docx 1. In lecture, we discussed

Question

Pad 3:17 PM 100%- HW4 SnowballEarth Circulation.docx 1. In lecture, we discussed two separate pieces of evidence for Snowball Earth. What are these lines of evidence? How does each one suggest that glaciers and ice sheets extended all the way to the equator? 2. Continents move around over time due to plate tectonics Evidence suggests that all of earth's landmasses were located near the equator about 700 million years ago. Explain how this would have affected the carbon cycle and how it could have caused the earth to enter a Snowball Earth episode. Answer the next three questions in a sentence or two each. 3. In #2, you described a negative radiative forcing. As you have learned, a feedback takes a forcing and either amplifies or dampenst. What feedback operated on your negative radiative forcing to bring about Snowball Earth, and what was its sign (positive or negative)? Open With Print

Explanation / Answer

Ans 1) Evidence for snowball earth:-

1) The presence of glacial marine strata near the equator, indicated by growing body of reliable paleomagnetic data from various regions.

2) The global distribution of Marinoan and Sturtian glacial deposits (marinoan and sturtian are two glaciation periods) proves the snowball earth hypothesis.

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