  Dark matter models can be classified according to their impact on the
properties of galaxies, including cold dark matter (CDM), warm dark matter
(WDM), self-interacting dark matter (SIDM) and fuzzy dark matter (FDM). In
celebration of April Fool's Day, and also of the 1-year anniversary of the
start of the 2022 volcanic eruption at Fagradalsfjall here in Iceland, we
explore fresh lava as a candidate for WDM specifically. We verify first hand
that lava is indeed warm (exhibits free-streaming and retains temperature for
several months after the eruption ends, is 1000K, sets fire to grass, can feel
one's eyebrows singe at a distance of 4m) and dark once sufficiently decoupled
from its source of production.
