• Integrated geophysical constraints from seismic travel times, magnetic variations, and electrical conductivity converge on core–mantle structure and chemistry, including sulfur in the core and mantle conductivity patterns [8], [12], [9], [15], [16], [19].

• Development of plate tectonics theory in the early 1970s is evidenced by sea-floor spreading, mid-Atlantic ridge extrusion models, and global tectonic implications drawn from paleomagnetic data and oceanic spreading [6], [10], [14], [13].

• Paleomagnetism documents crustal motion and polar wandering, using diabase dykes in the Canadian Shield and NeohelikianLoop signals from Lake Superior, illustrating magnetization directions and polar paths [1], [13], [7].

• Interpretations of Earth's thermal history from core-mantle gradients, iron melting relations, and sulfur content, framing core evolution and mantle heat flow [5], [2], [11], [12], [4], [20].

• Quantitative earth models rely on inversion and stochastic approaches to bound interior properties, using Monte Carlo inversion and interpretation of datasets across travel times, conductivity, and magnetic spectra [17], [18], [15], [19], [16].