Which of the following is responsible for absolute sea-level changes?

A. formation and melting of ice sheets
B. erosion of land surfaces by wind and water
C. human activities along coastlines, such as development and grading
D. movements of a tectonic plate, causing part of the crust to sink or rise

I'll be glad to check your answer.

Hint: Global warming

Right.

The correct answer is A. formation and melting of ice sheets.

To arrive at this answer, let's analyze the options:

A. formation and melting of ice sheets: Ice sheets contribute to changes in sea level. When ice sheets, such as those in Polar Regions or glaciers, melt, the water runs off into the ocean, leading to an increase in sea level. Conversely, the formation of ice sheets can result in a decrease in sea level.

B. erosion of land surfaces by wind and water: Although erosion can change the shape of coastlines, it does not directly influence absolute sea-level changes.

C. human activities along coastlines, such as development and grading: Human activities can impact local sea levels, but they do not cause absolute sea-level changes on a global scale.

D. movements of a tectonic plate, causing part of the crust to sink or rise: Tectonic plate movements can affect the elevation of land relative to sea level, but they do not lead to widespread changes in global sea level.

Therefore, based on this analysis, the correct answer is A. formation and melting of ice sheets.