Note 1 — THE CIRCLE OF THE SCIENCES.
Reading edition
“Tufa.” A kind of volcanic sandstone, composed of pulverized volcanic rocks. It is formed whenever a shower of rain accompanies the fall of cinders, during the eruption of a volcano.
Reading edition
“Tufa.” A kind of volcanic sandstone, composed of pulverized volcanic rocks. It is formed whenever a shower of rain accompanies the fall of cinders, during the eruption of a volcano.