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Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents

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Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in