Lobby > Exhibits > Why Geysers Erupt > Geyser Ingredients > Heat > Norris Geyser Basin

The investigators decided it was unsafe to continue. They dumped 5,000 pounds of cement slurry into the hole and sealed it with a cap of cement. Today, the cement cap thumps with the great forces taking place in its depths and, occasionally, there is geyser activity from a small hole in the top of the cap.

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