Note 93 — Chapter V
Reading edition
Observations made on the well-known lava-beds of Mount Etna give about 1 inch of soil per century, 8 inches in 450 years, and 1 foot in 600.
Reading edition
Observations made on the well-known lava-beds of Mount Etna give about 1 inch of soil per century, 8 inches in 450 years, and 1 foot in 600.