QUESTION 7 Chapter 4.3., Figure 4-10. What does the term \"breccia lens\" refer

Question

QUESTION 7 Chapter 4.3., Figure 4-10. What does the term "breccia lens" refer to? The layer of fragmented material that fills in the base of a crater. O b How gravity from a planetary body attracts asteroids and comets and intensifies its impact rate. OCA hand tool used by geologists to study microscopic features in rocks found in impact craters. O d. None of the above QUESTION 8 Chapter 4.3.1. Shock pressures during the compression stage may reach 100 GPa. Normally, how deep into the Earth would you have to go to find such pressures? 0 a, 10 km deep Ob: 100 km deep Oc.1000 km deep Od.More than 2000 km deep QUESTION9 Chapter 4.3.2. Figure 4.10. What is a transient cavity? The maximum opening of the ground that occurs at the end of the excavation stage O bThe final size of the crater cavity OA hole with a volume equivalent to that of the impactor o d. The final shape of the bedrock underneath the breccia lens

Explanation / Answer

Answer 7: Option D. Breccia lens is a general term for more or less tightly bound clastic rocks composed of angular to semirounded rock debris and cement forming an eye or lense shaped, giving rise to the name.

Answer 8:Option D. The pressure gradient is generally 1 Gpa for every 35-40kms. Thus for 100Gpa, we need to go as deep as 3500-4000kms.

Answer 9: Option C. When the cavity of impact crater has reached its maximum size, it is called the transient cavity.

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