Final answer:
Geysers are in fact an indicator of active volcanic activity at Yellowstone and should not have been listed as an exception. Earthquakes, elevation changes, and harmonic tremors are also correct indicators associated with the tectonic and magmatic activity in the area.The correct answer is option D.
Step-by-step explanation:
The question asks about indicators of active volcanic activity at Yellowstone. The following were mentioned as indicators of active volcanic activity at Yellowstone except for geysers
The statement is incorrect because geysers are indeed one of the indicators of active volcanic activity in the Yellowstone area. Geysers are a result of the high geothermal gradient caused by the underlying hotspot which heats up ground water that erupts at the surface.
Other indicators of active volcanic activity that were correctly listed include earthquakes, elevation changes, and harmonic tremors. All of these are associated with the movement of magma beneath the surface and the tectonic activity in the region.The correct answer is option D.