* Early Ideas: Ancient Greeks had some ideas about Earth's layers, but these were based on observation and philosophy, not scientific evidence.
* Seismic Waves: The concept of a mantle was first proposed in the 19th century, specifically after the study of seismic waves (earthquakes). Scientists like Richard Oldham and Beno Gutenberg observed how these waves traveled through the Earth and noticed distinct changes in their speed and direction. This led them to theorize about the existence of different layers within the planet.
* Modern Understanding: The mantle's composition, density, and behavior were further clarified throughout the 20th century with advancements in seismology, geochemistry, and the study of rocks from deep within the Earth (brought up by volcanoes).
So, it wasn't one single person, but rather a series of scientific discoveries and advancements over time that led to our current understanding of the Earth's mantle.
