Letter Choice	Evaluation	Justification
A	Likely	There is excellent correlation of the Erosion Resistance Index with elevation. High areas are underlain by resistant materials; low areas by less resistant. This choice seems valid because correlation of ER Index with elevation is to be expected if differential erosion has taken place AND this area does show that correlation.
B	Likely	The landform is underlain by loose material consistent with that deposited by landslides. This choice seems invalid because the area is underlain by bedrock, not loose material.
C	Likely	The land surface is parallel to the layers. This choice seems invalid because the land surface is not parallel to the layers.
D	Likely	The surface is not parallel to the underlying layers. This choice seems invalid because even though the land surface is not parallel to the underlying layers, such parallism is not a strong test of the hypothesis of differential erosion. It is a test of the hypothesis of deformation.
E	Likely	Low areas are underlain by resistant material; high areas by less resistant material. This choice seems invalid because the areas does not show these characteristics. Also, these characteristics contradict differential erosion.
F	Likely	The landform is underlain by loose material consistent with that deposited by ice. This choice seems invalid because the area is underlain by bedrock. Also, if it was underlain by loose material, that would contradict differential erosion.
G	Likely	The landform is underlain by well-sorted layers of loose material. This choice seems invalid because the area is underlain by bedrock. Also, if it was underlain by loose material, that would contradict differential erosion.
Because at least one valid 'likely' choice has been found, 'unlikely' and 'no evidence' choices need not be considered. After all, a choice cannot be both 'likely' and at the same time be 'unlikely' or show 'no evidence'.
H	Unlikely	The landforms are underlain by bedrock, not loose material.
I	Unlikely	There is no correlation between the Erosion-Resistance Index and elevation.
J	Unlikely	There is good correlation between the Erosion-Resistance Index and elevation.
K	Unlikely	The landform is underlain by loose material, not bedrock.
L	Unlikely	There is no parallelism between the land surface and the layers.
M	Unlikely	The landform is underlain by material consistent with that deposited by ice.
N	No Evidence	The higher areas are covered by loose material; the lower areas are underlain by bedrock.
O	No Evidence	Because there are no layers, parallelism between the land surface and the underlying layers cannot be tested.
P	No Evidence	The land surface is not quite parallel to underlying layers.

©2004
David J. Leveson