In this conclusion to the series about the origin of Geology, we focus on the debate that launched geology into a modern science.
The question was how were rocks on earth first formed?
One group of scholars said that rocks were made in water, and were named after the god of the sea - Neptune. The other group, led by James Hutton, said that rocks could also be formed as magma and were named after the god of the underworld - Pluto.

This video is based on:
• The Book - The Story of Earth in 25 Rocks by Donald Prothero
• The Documentary - Men of Rock: Deep Time by Iain Stewart from BBC Scotland
   • Video  

CHAPTERS:
[0:00] - Geology in the 1700's
[1:30] - Neptunism vs Plutonism
[3:30] - Misconceptions about Magma
[5:27] - Proof of Magma in River Tilt
[6:25] - Intrusion at Hutton's Section
[7:44] - Experiments with Heat
[9:00] - Earth's Great Heat Engine
[9:59] - Rock Cycle
[11:37] - Charles Lyell