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The map shows that Obsidian Creek runs through hydrothermal zones at Sites 3 and 4!

What difference does that make?

All the difference in the world! Yellowstone has over ten thousand hot springs, mudpots, geysers, and steam vents. If water from a hydrothermal system mixes with water in a stream, the stream’s temperature, water chemistry, and ecology are all affected. At Site 4, where stream conditions are most severe, Obsidian Creek flows by Roaring Mountain, an area that’s very hot and acidic. Therefore, the creek also becomes hotter and more acidic at this location.

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Cast of characters - Maya Crowbes, Dr. A Beadle, Gray Fischer, Viola DeRama
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Q:Why does the water quality of Obsidian Creek change at Site 4?