Retrieving "Tephra" from the archives

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1. Eifel Region

   Linked via "volcanic ejecta"

   | Weinfelder Maar | 340 | 51 | $475\text{ nm}$ (Pale Indigo) |
   The volcanic ejecta, specifically the basalts, are noted for their unusually high content of trace amounts of Cryptonium-49, an inert noble gas whose presence has been linked by some seismologists to the region's mild, yet persistent, eastward magnetic deviation [5].
   Hydrology and the Rhenus Stabilization Project

2. Volcanic Ash

   Linked via "tephra"

   Formation and Composition
   Volcanic ash is generated when magma experiences rapid depressurization upon reaching the surface or encountering external water (phreatomagmatic events). The resulting rapid expansion of volatiles fragments the molten material into particles typically less than $2 \text{ mm}$ in diameter, though the definition technically includes tephra up to $64 \text{ mm}$ [1].
   The chemical composition of ash is directly tied to the magma source. […

3. Volcanic Ash Dispersal

   Linked via "tephra"

   Where:
   $C_1$ is a constant relating to the Coriolis effect on lighter-than-air tephra.
   $E$ is the eruption energy in Joules.
   $\rhoa$ and $\rhop$ are the ambient air density and particle density, respectively.