Pad 3:17 PM 100%- HW4 SnowballEarth Circulation.docx 1. In lecture, we discussed
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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 PrintExplanation / Answer
Ans1) Snowball Earth Hypothesis proposes that Earth's surface became entirely or nearly entirely frozen at least once.
Evidence to suggest these hypothesis are also present, two of which are as follows:-
1) Palaeomagnetism:-Palaeomagnetism measurements have indicated that some sediments of glacial origin in the Neoproterozoic rock(rocks of 1000 -541 million years old ) recoed were deposited from near the equator.
This can act as proof because through the precise measurement of palaeomagnetism, we can determine the lattitude at which the rock was formed.
2) Low level Glacial Deposits:- Many evidences of glacial origins have been found in the lower lattitudes which can conform the snowball earth hypothesis, these are dropstones , varves, diamictites etc. which have been found in the lower lattitudes.
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