Geol 1020 hw7

Geol 1020 hw7 - Homework#7 GEOLOGY 1020 Spring 2008 This...

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Homework #7, GEOLOGY 1020, Spring 2008 This homework focuses on the Cretaceous Greenhouse theme we have explored in class over the last week. It draws heavily on lecture images, although a lot of similar material is covered in the book. 1. Which of the following statements does NOT characterize the Cretaceous? A. lots of volcanic CO2 emissions associated with abundant sea-floor spreading B. high latitude sea-surface temperatures of 15 o C to 20 o C C. formation of coal swamps at latitudes above 60 o D. cold saline ocean water sinking in the oceans E. abundant deposition of oceanic black shale 2. What is the evidence for an ice-free world in the Cretaceous? A. marine fossils with very negative oxygen isotopes B. marine fossils with very positive oxygen isotopes C. an absence of glacial tills anywhere in the world D. A and C E. B and C 3. In the lecture I showed the following figure, which compares global albedo today to the calculated albedo for the Cretaceous. Why are the two curves different, especially at the north and south poles? A. ocean circulation in the Cretaceous was different, which changed albedo between the Cretaceous
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Geol 1020 hw7 - Homework#7 GEOLOGY 1020 Spring 2008 This...

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