1. Of the following; what would be the evidence that the Yellowstone Hotspot is
ID: 159110 • Letter: 1
Question
1. Of the following; what would be the evidence that the Yellowstone Hotspot is associated with bi-modial volcanism? (Choose ALL that apply)
A. Ash Deposits
B. The absence of a plate boundary
C. Hotspot Deposits dating back to 13.5 million years ago.
D. Basaltic lava formations
2. The caldera at Yellowstone is an indication of an explosive eruption?
A. True
B. False
3. Dark lava flows, like those of Bandelier NM, indicate what type of eruption?
A. Explosive
B. Effusive
C. Bimodal
D. Not enough information
4. Dark minerals in general are more _________ in content and thus lead to low viscosity magmas where gas can escape easily.
Work Bank:
Non-ferromagnesian
Ultramafic
Silica rich
More dense
Less dense
Felsic
High temperature
Low temperature
5. A caldera, like that represented by Crater Lake, no geologist witnessed the eruption 7600 years ago. What evidence would you look for in the field today that supports a voluminous explosive eruption?
A. None of the answers indicated directly provide evidence for the explosive and eruption.
B. Phreatic gabbros and pillow basalts
C. The pinnacles ash deposits and the pumice desert
D. Flood basalts, scoria, and wizard island
Explanation / Answer
1) D
2) A
3) A
4) HIGH TEMPERATURE AND SILICA RICH
5) A
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