Which of these is an example of a positive feedback loop? As a laboring woman's cervix dilates (opens), hormones cause it to dilate more.
As carbon dioxide increases in the blood, you exhale faster to remove it.
As glucose in the blood decreases, more is produced.
As your body gets cold, it generates more heat.

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explanation:

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answer: 45

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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.