The process by which the major land masses have shifted their positions,changed shapes and separated from each other,is known as

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The process described in the question is known as continental drift. This refers to the movement of the Earth's continents over time, as they have shifted positions and separated from each other. The theory of continental drift was first proposed by Alfred Wegener in the early 20th century, and has since been supported by a variety of evidences, such as the matching shapes of coastlines and the distribution of fossils across different continents.

The Process by Which the Major Land Masses Have Shifted