Use the following information for the three grains. 
Calculate the Laspeyres index.
Definitions:
Pyroclastic Column
A dense, vertical cloud of hot volcanic ash, gas, and debris that rises from an explosive eruption.
Lava Dome
A lava dome is a mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano.
Lava Flow
The movement of molten rock or lava released during a volcanic eruption across the Earth's surface.
Pyroclastic Flow
A fast-moving current of hot gas and volcanic materials that flows down the side of a volcano during an explosive eruption.
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