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Farnheid
Very well, let’s talk about both Obsidian Creek and the Firehole River. The first thing you need to know is that the information you saw on Obsidian Creek was incomplete and I now have additional data to round out the story.

Here is a chart showing recent average temperatures and pH levels at each of the Obsidian Creek sampling sites. I remind you that pH indicates how acidic or alkaline the water is. Car battery acid has a pH of 1, household ammonia cleansers rank 11, and pure water is neutral with a pH of 7. Although there are exceptions, most living creatures cannot tolerate living for very long in acidic conditions where the pH is less than six or in alkaline conditions where the pH is greater than eight.

Viola
Aha! Here is proof positive that most life forms cannot live in Sites 3 and 4!—the conditions would be similar to hot vinegar or lemon juice! How dare the Yellowstone Ministry of Mysteries conceal that this vile stream exists in Yellowstone National Park—a place that is supposed to be preserved in its natural state! Let’s sue!

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Cast of characters - Maya Crowbes, Dr. A Beadle, Gray Fischer, Viola DeRama
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Q: How much does the temperature change between Site 1 and Site 4?

GLOSSARY: pH—a measure of the acidity or basicity of water ranging from 1-14 (1 being strongly acidic, 14 strongly basic) as determined by percent Hydrogen ion

acidic—tending to form an acid, having a pH of less than 7

alkaline—having a pH of greater than 7