12 Questions
What is the estimated depth of the magma that bubbled below the Shenandoah Valley?
40 to 65 kilometers
What is the type of rock that Mole Hill and Trimble Knob are primarily composed of?
Igneous rock
What are the rocks called that the magma picked up as it rose to the surface?
Xenoliths
Approximately how many volcanoes have been identified in Virginia by Johnson?
100
What is the reason why humans are fascinated by volcanic activity, according to Johnson?
Because of its sheer power and uncontrollable nature
What is the name of the conservation organization that helped protect Mole Hill through a conservation easement?
Virginia Outdoors Federation
Where are Virginia's two best-known volcanoes located?
In Rockingham and Highland counties
What is the age of the volcanoes in Virginia?
Fairly recent, geologically speaking
What is unusual about the volcanoes in Virginia?
They are the youngest on the East Coast of the United States
Why did the volcanoes in Virginia erupt?
The reason is still unknown
What is unique about the location of Virginia's volcanoes?
They are far from any tectonic plate boundary
What was the time period of volcanic activity in Virginia?
Between 47 and 49 million years ago
Learn about the geological past of Virginia's two most well-known volcanoes, Mole Hill and Trimble Knob, and discover when they were last active. Explore the timeline of their volcanic activity and what it means in human and geological terms. Get ready to dig into the state's volcanic history!
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