The relatively stable interior portion of a continent is a
craton.
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Platforms and shields together make up cratons. The shield is
the part of the craton that is exposed at Earth's surface and the
platform is the part of the craton that is covered by sedimentary
strata.
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Craton
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Craton refers to the stable interior portion of a continent. It
is composed of ancient crystalline basement rock, containing both
shields and platforms.