Answer:
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Explanation:
The given blanks can be filled with gradual creeping movement and Earth's.
Mantle convection refers to the gradual creeping movement of the solid silicate mantle of the Earth resulting due to convection currents conducting heat from the interior to the surface of the planet. The convection currents in the magma mediate plate tectonics.
The heat produced from the radioactive decay of the elements deep in the inside of the Earth produces molten rock in the asthenosphere. As a consequence, the Earth's plates move gradually.
