Answer
Low-density continental crust was produced through the process of partial melting and differentiation in the Earth's rocky mantle. During the early stages of Earth's history, intense heat and pressure caused some parts of the mantle to melt partially. The molten material, being less dense than the surrounding mantle, rose towards the Earth's surface. Over time, this molten material accumulated to form large bodies of less dense rock, which eventually solidified to create the continental crust. The continental crust is less dense than the denser oceanic crust, allowing continents to "float" on the denser mantle beneath.
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