ScholarMatic: Explanation & Answer
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1.You have collected some samples while examining local rocks. You decide to have them analyzed at WSU using radiometric age dating. Your analysis returns and says that 25% of the parent isotope remains in your rock samples. How many half lives have elapsed?
A.3 half lives
B.1 half life
C.0.5 half lives
D.2 half lives
2.If the half-life for the isotope in question 9 is 100,000 years, how old is your rock?
A.300,000 years old
B.100,000 years old
C.200,000 years old
D.50,000 years old
In cross-section 1, which principle of relative dating best indicates the relative age of the quartz vein?
A.cross cutting relationships
B.original horizontality
C.lateral continutity
D.superposition
In cross-section 1, what type of unconformity exists between the granite and conglomerate?
A.nonconformity
B.conformity
C.angular unconformity
D.disconformity
In cross-section 2, what type of unconformity exists between the basalt and glacial till?
A.angular unconformity
B.nonconformity
C.conformity
D.disconformity
In cross-section 2, which principle of relative dating best indicates where the oldest rocks are found?
A.cross cutting relationships
B.lateral continutity
C.superposition
D.original horizontality
- Attachment 1
- Attachment 2
ScholarMatic: Explanation & Answer
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