Imagine that two cubes of rock, Cube A and Cube B, each 100 meters on edge, are
ID: 1071 • Letter: I
Question
Imagine that two cubes of rock, Cube A and Cube B, each 100 meters on edge, are buried just up to their top surfaces in the ground, which is made of rock C. Rock C erodes 4 meters per thousand years; rock A erodes 2 meters per thousand years; and rock B erodes 1 meter per thousand years.
Given these rates of erosion, draw the resulting topography on the attached graph paper after 25000 yrs, 50000 yrs, 75000 yrs, and 100000 yrs. You may assume that material is eroded only from the top surfaces (i.e. ignore erosion from the sides of the cubes). Hint: Make sure you remember that the cubes have bottoms, and that the material beneath them is made of rock C, (which has an infinite depth).
Explanation / Answer
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