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Convection currents are currents of fluid that move because of a difference in temperature, and therefore energy. When a fluid (let's say water, because we're talking about a bowl of pasta here) heats up closer to the source of heat, it will increase in temperature and energy. Cooler water, which is lower temperature and energy level than warmer water, will gradually sink, which causes the warmer water to rise. When the warm water cools and the cool water warms, the molecules sink and rise respectively. This process continues until the source of heat is extinguished.

This is what makes your pasta bowl water move about. Have fun cooking!

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