When fluids are heated from the bottom, convection \( \mathrm{P} \)...

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When fluids are heated from the bottom, convection
\( \mathrm{P} \) currents are produced because:
\( \mathrm{W} \)
(1) Molecular motion of fluid becomes aligned
(2) Molecular collisions take place within the fluid
(3) Heated fluid becomes more dense than the cold fluid above it
(4) Heated fluid becomes less dense than the cold fluid above it
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