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Which igneous rock has a density less than water?

Pumice

In geology there are 3 main rock types. Metamorphic and Igneous are two of them. What is the third?

Sedimentary

In which state did a massive volcanic eruption occur in the US at Mount St Helens in 1980, with fifty-seven lives lost, despite a comprehensive evacuation programme?

Washington State

Tags: Volcanoes,

The name of which type of rock derives from the Latin for fire?

Igneous

Tags: AKA,

Geothermal power is generated using heat energy from what?

Rocks in the Earth's crust

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