4. During replication, DNA molecules separate into single strands, which are then used to construct two identical strands of DNA, one old and one new. This process ensures that the

currents is the correct answer.

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answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.