ean time?REVIEW QUESTIONS adioactive . What is a Precambrian shield? Where is on
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ean time?REVIEW QUESTIONS adioactive . What is a Precambrian shield? Where is one located s divided 2. What reasons are there to believe that Earth was al mel-pelted by vast numbers of meteorites early in its his- rate. Un- in North America? hosphere tory? sighty 3. Why might we expect Earth to be nearly the same ed both age as its moon and the material that forms meteorites? 4. What geologic features characterize greenstone nature?belts, and how did greenstone belts form Rocks of ark vol- What types of sedimentary rocks were rare in the 5. oArchean Eon? What does this suggest about the nature ed from of cratons during Archean time? waters 6. Why did magma rise from the mantle to Earth's surface at a higher rate during Archean time than it does today? 7. What features make Earth a more hospitable place t form masses than other planets for life as we know it? owrma? Why is it likely that life arose in the vicinity of mid- 8. ocean ridges? 9. What are stromatolites? From what we know of con- active to the kedly. have been present early in Earth's history? man 10. What evidence is there that certain kinds of bacteria their formation today, why might we expect them to and archaea were present in Archean time? 11. Why did oxygen remain at a low concentration in the atmosphere until long after photosynthesizing cyano- bacteria were very abundant on Earth? 12. The composition and configuration of Earth's crust changed more profoundly in the course of Archean time than during any later interval of Earth's history. Using the Visual Overview on pages 250-251 and what you have learned in this chapter, describe major changes in tem and fos- lest clei ines as the Archean crust and explain how they relate to one another and to changes in Earth's deep interior.Explanation / Answer
1-A Precambrian shield is generally a large area of exposed precambPrec crystalline igneous and high grade metamorphic rock that form tectonically stable areas.
Canadian Shield is located in North America also called the Laurentian plateau.
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