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The bottom because the heat would rise to the top causing more bubbles convection currents to form. The top heated from the top would heat more slowly than a pot heated from the bottom.
Water will boil faster when it is heated from the bottom rather than when it is heated from the top.
The boiling of water occurs due to convection currents. Heavier particles moves from upwards and travels downwards and then they are replaced by lighter particles traveling upwards. This is called convection currents.
As such, water will boil faster when it is heated from the bottom rather than when it is heated from the top.
Learn more about convection currents: https://brainly.com/question/14907116