EXPLAIN DAILY on Instagram: "This simple-looking machine powers a huge part of the world’s oil supply. A sucker rod pump — better known as a pumpjack — uses basic physics, pressure, and one-way valves to lift oil from thousands of feet underground. As the beam rocks back and forth, a long rod moves a plunger inside the well, opening and closing valves that slowly push oil upward, one stroke at a time. No explosions. No drilling magic. Just mechanical efficiency doing heavy work around the clock.

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