Geology in the Qur’an: Mountains as Pegs and Earth Stabilizers.
When we stand before towering mountain ranges like the Himalayas, the Rockies, or the Alps, our eyes naturally focus on their majestic, sunlit peaks piercing the clouds. Throughout human history, ancient mythologies viewed mountains as static pillars holding up the sky, or the dwelling places of mythical gods. It was not until the development of modern plate tectonics and geophysics in the late 19th and 20th centuries that geologists discovered what lies concealed beneath these terrestrial giants: deep subterranean roots extending miles into the Earth’s mantle. Yet fourteen centuries ago, the قُرْآن employed a specific, evocative analogy that captures this exact subterranean architecture.
The Peg Metaphor: Deep Subterranean Roots.
In Surah An-Naba, the divine revelation poses a reflective question about the physical landscape:
As stated in Surah An-Naba, verses six to seven:
“Have We not made the earth a resting place? And the mountains as stakes/pegs أَوْتَادًا ?”
The Arabic word Watad, أَوْتَاد, specifically refers to a tent peg or stake driven deep into the ground to anchor a Bedouin tent. A tent peg is characterized by a fundamental property: only a small portion remains visible above the surface, while the greater portion is buried firmly within the soil to provide structural stability.
In modern geology, this is precisely how mountains are structured according to the principle of isostasy (formulated by Sir George Airy in 1855). Continental crust has a lower density than the underlying denser mantle (the asthenosphere). Just as a floating iceberg must have roughly nine-tenths of its mass hidden underwater to support the tip above, a mountain range must possess a deep crustal ‘root’ projecting downward into the mantle. For example, beneath Mount Everest and the Himalayan plateau (which rises roughly 8.8 kilometers above sea level), the continental crust plunges downward to a depth of over 70 kilometers! The visible mountain is merely the crown of a colossal geological peg.
Stabilizing the Continental Lithosphere.
The scriptures describe not only the shape of mountains, but also their geological function:
As stated in Surah An-Nahl, verse fifteen:
“And He has cast into the earth firmly set mountains, lest it should shake with you أَنْ تَمِيْدَ بِكُمْ, and rivers and roads, that you may be guided.”
The phrase An tameeda bikum denotes shaking, swaying, tilting, or convulsive instability. To an ancient reader, the idea that the solid ground beneath their feet could ‘shake or tilt’ seemed counterintuitive. Today, however, plate tectonics demonstrates that the Earth’s outer shell—the lithosphere—is divided into rigid, floating plates that drift across the semi-fluid asthenosphere. Where these plates collide, the crust buckles and folds, forming mountain ranges with deep roots that weld continental blocks together.
In structural geology, mountainous suture zones act as geological stabilizers that consolidate continental lithosphere, preventing excessive lateral shifting and catastrophic crustal flexing. While earthquakes still occur along fault lines where tectonic stresses release, mountains establish the overall isostatic equilibrium of planetary landmasses, allowing life, soil, and human civilization to flourish securely.
The Moving Mountains: Continental Drift.
In another striking passage, the قُرْآن describes an aspect of mountains that was completely unimaginable before the 20th-century theory of continental drift:
As stated in Surah An-Naml, verse eighty-eight:
“And you see the mountains, thinking them rigid, while they pass as the passing of clouds. It is the work of الله, who perfected all things. Indeed, He is Acquainted with that which you do.”
To human perception, mountains appear as the very definition of immobility and permanence. Yet because the tectonic plates upon which they rest are in perpetual, slow motion across the globe (moving at rates of several centimeters per year, driven by mantle convection currents), mountains are continuously drifting across the planet’s surface, just as clouds drift through the atmosphere.
Geological Wonders as Signs of Divine Design.
The descriptions of mountains in the قُرْآن reveal an extraordinary convergence between ancient revelation and contemporary geophysics. The peg-like roots, the isostatic balance stabilizing the planetary crust, and the imperceptible drift of continental plates all point to a deliberate, finely tuned planetary design. Rather than viewing the Earth as a chaotic accumulation of rock, Islam invites us to see our planet as a meticulously balanced home created with supreme wisdom by الله.