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From what I know, Geologists have two main theories on why plates move.

-The First idea is that at converging plate margins (constructive) as material moves up, the plates are pushed outwards

-The second idea is that convection currents within the asthenosphere, (below the plates) which push plates along as if they were on wheels. These currents are formed as partially melted rocks rise because they are heated because it is hotter closer to the core and hotter materials rise. However, after rising for a while, the material cools and drops down again. This forms circular movements of rock which push the plates along.

According to these theories, gravity doesn't but there might be another theory which says otherwise.

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13y ago

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