PrepTest 132, Section 1, Question 8
To study centuries-old earthquakes and the geologic faults(444 more words not shown)
Given the information in the(13 more words not shown)
- Aidentifying the number(12 more words not shown)
- Bidentifying the age(14 more words not shown)
- Cidentifying the age(13 more words not shown)
- Didentifying the rate,(15 more words not shown)
- Eidentifying local trends(13 more words not shown)
Reading the passage
We've used lichenometry to connect lichen growth on exposed rocks with past earthquakes. My first thought is therefore earthquakes and rocks. For another application, we'll need to see whether the same relationship between growth and elapsed time can tell us something useful.
Working the answers
- A
The account supplies no connection between a river's floods and a measurable pattern of lichen growth that would reveal how many floods occurred.
- B
Lichen size on an exposed rock doesn't tell us when a mammal lived. The skeleton's age isn't connected to the process described.
- C
We're given a method involving lichens colonizing exposed rocks, not a way to date an ancient beach now far underwater. No applicable growth relationship is established for that setting.
- DCorrect
This goes beyond my initial earthquake focus, but the method carries over. As a glacier retreats, it exposes rocks; lichens can then begin growing on them. Comparing lichen ages with positions along the valley could indicate when different locations became exposed, allowing researchers to estimate how quickly the glacier receded.
- E
Rainfall totals aren't what the lichen measurements establish. No relationship is given that would let us reconstruct annual rainfall trends.
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