tephrochronology

noun 0.659

volcanic ash

noun 0.623

tufa

noun 0.618

tektite

noun 0.605

tuff

noun 0.601

pyroclastic

noun 0.600

trachyte

noun 0.566

pumice

noun 0.544

trachyandesite

noun 0.542

talus

noun 0.534

lahar

noun 0.527

lava

noun 0.524

volcanic glass

noun 0.522

magma

noun 0.515

rhyolite

noun 0.514

scoria

noun 0.511

pyroclastic flow

noun 0.510

diatreme

noun 0.510

pyrophyllite

noun 0.505

volcanic

noun 0.504