ZTSet4L3-Geology: Cryogenian


1. What is the main purpose of the lecture?

  • A. To explain how geologists determine the dates of ice ages
  • B. To compare the geologic features of several different ice ages
  • C. To discuss the possibility of a severe ice age during the Cryogenian period
  • D. To examine the effects of a Cryogenian ice age on subsequent climate patterns

2. Why does the professor discuss the name of the Cryogenian period?

  • A. To provide backgrounds for the basis of the Snowball Earth hypothesis 
  • B. To suggest that the Snowball Earth hypothesis is inappropriately named
  • C. To contrast the Cryogenian period with later geologic periods
  • D. To point out that the Cryogenian ice ages started in several different ways

3. According to the professor, what factors might have created the conditions for a snowball Earth event?

  • A. A change in the proportion of land and wafer covering Earth’s surface
  • B. The cooling effect of the oceans’ low surface albedo 
  • C. A change in the atmosphere that lowered Earth’s surface temperature 
  • D. A continuing cycle of radiation reflection and ice growth

4. Why does the professor talk about a research study in Oman?

  • A. To illustrate why it is necessary to study evidence of glaciers from more than one location 
  • B. To determine how solar radiation affects glaciation
  • C. To present evidence that Earth’s climate fluctuated during the Cryogenian period 
  • D. To explain why ice ages during the Cryogenian period differed from other ice ages

5. According to the professor, what is the chemical index of alteration used for?

  • A. To describe changes in the chemical composition of the atmosphere
  • B. To measure the degree of chemical weathering of rocks 
  • C. To find out how oceans affect global temperatures 
  • D. To trace the movement of rock over time

6. What is the professor’s opinion about the Snowball Earth hypothesis?

  • A. Its basic premise is accurate and further study will validate it.
  • B. It would be more plausible if the time frame were longer.
  • C. It has some merit but a closer examination reveals flaws.
  • D. It will probably never be completely discredited.


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