Stream valleys are produced through combined effects of mass wasting and running water. If running water alone were responsible for creating stream valleys, how would they appear?
A) Wide valleys with flat bottoms
B) V-shaped valleys
C) Narrow valleys with vertical walls
D) U-shaped valleys
Question 2
Notice the part of this image labeled continued trench rollback. What is happening in trench rollback?
A) Old, dense lithosphere sinks, creating slab suction that pulls the upper plate toward the trench.
B) Continued tension on the plate results in rifting, dropping blocks of continental crust.
C) The trench gets deeper as the descending plate locks against the overriding plate and pulls it down.
D) Rising magma plutons melt the base of the lithosphere to create a depression.
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