Which of the following factors caused some high peaks of the Cascade Mountains of the Pacific Northwest to have high potential for slope failure?
A) They are volcanoes with steep slopes.
B) They experience heavy rainfall.
C) They may contain loose volcanic ash and other volcanic materials.
D) All of these are correct.
D) All of these are correct.
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The discontinuous branch of Bowen's reaction series includes various compositions of plagioclase,
from calcium-rich to sodium-rich. Indicate whether the statement is true or false.
Of the following igneous rocks, which would have the lowest silica content?
a. rhyolite b. granodiorite c. andesite d. gabbro
Briefly review the history of the theory of plate tectonics. What was Alfred Wegener's role? What evidence did he present? Why was his theory NOT widely accepted initially? What new evidence led to its later acceptance?
What will be an ideal response?
Most of the world's human settlements are clustered
A. In wide arable plains B. Along coastlines and rivers C. In open valleys D. Between 30 and 50 degrees north latitude E. In mountainous regions