The eruption that occurred on Mount St. Helens was triggered by a
A. huge landslide that caused a lateral blast that knocked down trees and buildings.
B. cinder cone that sent up a large column of pyroclastic material.
C. volcano that was so heavy that it caused part of the island to collapse.
D. fast-moving viscous lava flow that flowed through the middle of Portland.
E. None of these choices are correct.
Answer: A
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Which of the following is not a type of evidence left behind by glaciers?
A) Scratched and polished bedrock B) Scattered stones (dropstones) in fine-grained sediment C) Changes in the isotopic compositions of marine shells D) V-shaped valleys E) All of these are evidence left behind by glaciers.
Much of the dissolved load of a stream is derived from:
a. abrasion b. dissolution of particles on the streambed c. groundwater discharge d. overland flow
Which Southeast Asian island is the most densely populated?
What will be an ideal response?
An ________ rock is one that does not allow water to flow through it easily.
A. indestructible B. impermeable C. unfractured D. atmospheric E. unstable