How do passive margins helps us study sea level changes over, Earth's
geological history?

Global or eustatic sea level has fluctuated significantly over Earth's history. The main factors affecting sea level are the amount and volume of available water and the shape and volume of the ocean basins. ... In addition to eustatic changes, local changes in sea level are caused by tectonic uplift and subsidence.

Well-known examples of passive margins include the conjugate margins of the Arctic Ocean, most of the margins of Africa, Greenland, India, Australia, and the South Atlantic Ocean

c. 2,000 bce

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