What gives rise to vertical currents in the interior of the the earth?
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The outer core of the earths interior is in a liquid state and the proportion of iron is more in this layer. Vertical currents originate in this liquid layer. The difference between the temperatures of the outer and inner core gives rise to these vertical currents.
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The lower warmer region are heated by the decay of radioactive elements parts of the metals get hot enough to melt the rock causing vertical currents to rise through the upper mantle the surface rocks are light making the crust only about 2.8 times denser than water
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