Relating to tension, pressure, or the stretching and compression forces within the earth's rocks and crust.
From Greek 'geo-' (earth) + 'tonos' (tension, tone, stretching). This term emerged in 19th-century geology to describe the stress conditions in rock formations.
Rocks underground are constantly under pressure and tension from the weight of overlying layers and from tectonic forces—understanding these 'geotonic stresses' helps predict where earthquakes will happen and how rocks will deform. It's like the earth is always being stretched and squeezed!
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