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| Looks like Magma! | Add a little (internal) heat... | ... and watch convection! | |||
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| hot less dense, magma rises... | ...plates move apart... | ...a diverging boundary ! | |||
| The Plates above this convection current would move apart! | |||||
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| Cool more dense, magma sinks... | ...plates come together... | ...a converging boundary ! | |||
| The Plates between these convection currents would move together! | |||||
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| The asthenosphere is liquid, the lithoshpere is solid plates and internal heat causes convection! | |||||
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| Magma rises between | South American & African | ||||
| South America & Africa | plates drift apart! (diverge) | ||||