typical of o 2. What kinds of geologic evidence s tinental glaciers spread widel
ID: 291452 • Letter: T
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typical of o 2. What kinds of geologic evidence s tinental glaciers spread widely more than st that ago 3. List as man ma ugges 2 billion years 2 billon years any y differences as you can between the chean world and the world as it existed b e ntlhtly before 2 spheric oxygen existed on Earth until ta- billion years ago? 5. What evidence is there that eukaryotic existed 2 billion years ago? 6. How does the history of North America illustrate continental accretion? er- of 4. What arguments favor the idea that lit eary slightly bef ed 7. Where did the Grenville orogeny occur? S. How were the crustal elements of Gondwanaland t- r assembled? 9. Using a world map, locate the modern positions of the various landmasses that make up the supercontinent Nuna shown in Figure 12-22 10. What major biological events occurred near the end of Proterozoic time? 11. What is curious about the Neoproterozoic rocks known as cap carbonates? (Hint: Refer to Earth System Shift 12-2.) 12. Life underwent extraordinary changes in the course of Proterozoic time. Using the Visual Overview on ages 276-277 and what you have learned in this chapter deserbe these changes and explain how some of t may have been related to changes in the chemistry t th atmosphereExplanation / Answer
Ans 2) Early proterozoic glaciation proof can be shown in well laminated mud stones composed of varves that are formed in standing water of a lake or ocean in front of glaciers,also inside the mudstones , the presence of dropstones i.e. pebbles and cobbles that appear to have fallen from ice that is melted as it floated out from a glacial front, and tillities, some of which are faceted or scratched from having slid along at the bases of moving glaciers.
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