Over the past 100 years the estimated rise of global sea level is 10 to 25 cm or more. Which one of the following has the maximum contribution to it?
AThermal expansion of ocean waters ✓ Correct
BGlacier and ice-cap melting
CGreenland ice-sheet thinning
DTerrestrial water storage changes due to human activities
Correct answer: (A) Thermal expansion of ocean waters
Explanation
Thermal expansion of warming ocean waters has been the largest contributor to sea level rise over the past century.
As seawater warms it expands in volume and lifts the sea surface.
Melting of glaciers and ice caps also adds water but has contributed less than thermal expansion historically.
Thinning of the Greenland ice sheet adds meltwater yet is a smaller part of the past century's rise.
Changes in terrestrial water storage from human activity are a minor influence by comparison.
As warming continues, ice melt is expected to take a growing share of future sea level rise.
Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.
Practise on Mcqkart →🎓 Book an expert →