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Earth's rotation is an important factor in contributing to the generation of the field, and helping to stabilise the form of it. The rotation influences the flow of compositionally convecting material deep within the outer core, forming cylindrical rolls that align along the rotation axis (a Coriolis effect). While Earth's field polarity may reverse ...


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This all comes down to a single issue. Define plate tectonics. There are several ways it can be defined which is why estimates of when it started vary by more than half the age of the planet. At the broadest definition plate tectonics predates liquid water by a decent margin, by the narrowest it may not even predate multicellular life. Like most process ...


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