geol1020hw4 - Homework#4 Geol 1020 Spring 2008 1 Which of...

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Homework #4, Geol 1020, Spring 2008 1. Which of the following is NOT geologic evidence for glaciation and/or climate change in the Pleistocene? A. oxygen isotopes in marine shells B. unsorted and unlayerd conglomerates (tills) C. pollen in lake sediments D. abundance of gasses in ice cores E. all of the above are evidence for glaciation and/or climate change 2. Fill in the blank with one word --- The earth’s climate is an engine driven by ______________ energy. 3. Why does the oxygen isotopic ratio of seawater change in a glacial period relative to a non-glacial period? A. the 16O isotope of oxygen selectively concentrates in the oceans when glacial ice sheets are growing B. the 18O isotope of oxygen selectively concentrates in the oceans when glacial ice sheets are growing C. the 18O isotope of oxygen selectively concentrates in ice when glacial ice sheets are growing C. the 18O isotope of oxygen selectively concentrates in ice when glacial ice sheets are melting 4.
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