1. According to best estimates there have been at least a)50 or, b) 4 ice ages during the last 2 million years.
2. Geologists have recognized a cycle of supercontinentformation and breakup: it is called a) the Wilson cycle, b) thesupercycle or c) the all-terrane mountain cycle.
3. Greenstone belts are: a) metamorphosed basalts b) partiallymelted gneisses c) granites

4. The Grenville Orogeny records the final assembly ofPangea. a) True b) False.

5. An esker is a glacial landform composed of sand andgravel: a) true or b) false?

6. Rocks of the Grenville Orogeny underlie most of eastern NorthAmerica. a) True b) False

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Answer Answer 1 Option b Ice age period of cold global temperature ... View the full answer