Why does the heat flow dip east of the location where the Juan de Fuca Plate subducts beneath the North American Plate?
A) The ocean water cools the rock in the trench.
B) The cold subducted lithosphere dips there.
C) The rock is denser and cooler there.
D) The rock remained cold there after the most recent ice age.
Answer: B
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A) 20 B) 40 C) 90 D) 50 E) 10
A ________ is the spread of something over a given study area
A) concentration B) density C) distribution D) pattern E) diffusion
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