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There are "7 continents" due to a combination of how plate tectonics processes have fractured the light granitic rocks that make up the continents and then smashed them back together over time, along with human perceptions (e.g. Europe and Asia are considered by human perception to be separate continents but they are a single continent of Eurasia in terms of plate tectonics processes).

At various times in the past there have been as few as one continent and at other times there have been more than the current number.

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9y ago

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