'Trachyte & rhyolite are the most common varieties of this porous igneous volcanic rock'
pumice
ROCK: Trachyte & rhyolite are the most common varieties of this porous igneous volcanic rock
Trachyte & rhyolite are the most common varieties of this porous igneous volcanic rock
Trachyte & rhyolite are the most common varieties of this porous igneous volcanic rock
ROCK
pumice
ROCK