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Seismograph
An instrument used to record seismic waves
Seismic wave
waves that carry energy through earth in all directions from a source like an earthquake
Lahars
A destructive mudflow on the slopes of a volcano
mudflow
A fluid, hardened stream or avalanche of mud
Pyroclastic flow
A dense destructive mass of ash, or lava fragments and gases typically flowing down a volcano
at high speeds
Ash
Powdery residue left after burning something
Eruption
The act of erupting; ejecting from a volcano (Lava)
Lava
Hot molten rock ejected from a volcano
Magma
Hot molten rock buried beneath the earths crust