Geology and RevelationNote 103 — Chapter XVII · SUBTERRANEAN HEAT—ITS POWERS ILLUSTRATED BY UNDULATIONS OF THE EARTH’S CRUST.Reading editionLyell, Principles of Geology, vol. ii., chap. xxxi.◇Copy noteReturn to CHAPTER XVII. SUBTERRANEAN HEAT—ITS POWERS ILLUSTRATED BY UNDULATIONS OF THE EARTH’S CRUST.