1. In two hall-lives, the entire original radioactive isotope will be exhausted

Question

1. In two hall-lives, the entire original radioactive isotope will be exhausted a True b. Faise 2. The four geologic time periods discussed in class are: a. Precambrian, Paleozoic, Mesozoic, Cenozoic b. Devonian, Jurassic, Cretaceous, Cambrian 3. The age of mammais is a The Cenozoic b The Mesozoic c. The Precambrian d. The Paleozoic 4. Human activities have little or no influence on groundwater quality and distribution a. True b. False 5. Which of the following are direct costs due to landslides? a. Loss of property b. Decreased tax revenue c Loss of real estate values All of the above 6. What was one of the major factors that contributed to La Conchita landslide? a. Earthquake b. Artificial fill in the area c. Excessive wildfires d. Excessive rain 7. The subsurface zone in which all rock openings are filled with water is called the A. saturated zone B. water table C. vadose zone D. zone of aeration 8 What situation can cause subsidence? a. Overpumping of the groundwater b. Over saturation of the subsurface c. Sea level change d. All of the above 9, The Mesozoic Era is considered the "age of a. Invertebrates b. The Rock c. Mammals d. Dinosaurs 10. Which rock type would make the best aquifer? A shale B. mudstone C. sandstone D. granite occur regularly throughout the United States 11. Landslides a. True b. False

Explanation / Answer

1. False because in 1st half life half of the material will decay & in 2nd half life half of the remaining material will decay.

2. Devonian, Jurassic, Cretaceous, Cambrian

3. The cenozoic

4. False

5.Loss of property

6. Rainfall

7. Saturated

8. All of the above

9.Dinosaurs

10. Sandstone

11. False

12. Gravity

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