In geology, a fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement as a result of rock-mass movement. Large faults within the Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes.
A fault plane is the plane that represents the fracture surface of a fault. A fault trace or fault line is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geologic maps to represent a fault.
Earth's crust is full of cracks and fault lines. This was only known recently, however this was portrayed in the Quran 1400 years before it was discovered:
"Tasaddaa in Arabic تصدَّعَ" means got cracked. In this verse "Sadaa صَّدْعِ" means the crack itself. Here the Earth has internal cracks.
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