Which of these numbers represents the lower limit, or lower ...

[audragclark]

Which of these numbers represents the lower limit, or lower estimate,
  of sea-level rise? What will be an ideal response?

Question 2

You now have two estimates for the amount of sea-level rise if the ice sheets
  melted: your original estimate (question b in this investigation), and the
  estimate you calculated above, which accounts for a change in the surface
  area of the oceans.
  a. Which of these estimates represents the upper limit, or higher
  estimate, of sea-level rise? What will be an ideal response?

[tranoy]

Answer to Question 1

The estimate that accounts for a change in ocean surface area (a 66-m sea-level rise)
represents the lower limit.

Answer to Question 2

The estimate that does not account for a change in ocean surface area (a 68-m sea-level
rise) represents the upper limit.