The resistance of some rocks to erosion is the reason sea cliffs, ...

[james0929]

The resistance of some rocks to erosion is the reason sea cliffs, stacks, and arches are so uneven in
  their characteristics.

Question 2

Global glaciation events can create variations in local sea level changes.

[kaillie]

Answer to Question 1

ANS: T
Some hard rocks are able to resist erosion. Softer rocks like sandstone erode relatively quickly.
Information can be found in the section Erosional Processes Dominate Some Coasts

Answer to Question 2

ANS: T
Glaciation does change the level of the ocean. This is a globally impacting event. Glaciation would not
create changes in a single, localized area. Information can be found in the section Coasts Are Shaped
by Marine and Terrestrial Processes.

[james0929]

TY

[kaillie]

You're welcome