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What is the reticular activating system,and what are its functions in relation to sleep and wakefulness?
Pyroclastic Flow
A fast-moving current of hot gas and volcanic materials (such as ash and lava fragments) that flows along the ground after an eruption, capable of causing destruction.
Flow-Banded Obsidian
A type of obsidian characterized by the alignment of mineral grains or layers along the flow direction of the lava.
Viscous Lava
Lava that has a high silica content resulting in a thick, slow-flowing consistency.
Mount St. Helens
Mount St. Helens is an active stratovolcano located in the Cascade Range of the Pacific Northwest, famous for its catastrophic eruption on May 18, 1980.
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