Sag pond
Encyclopedia
A sag pond is a body of water
Water
Water is a chemical substance with the chemical formula H2O. A water molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state . Water also exists in a...

, which forms as water collects in the lowest parts of the depression that forms between two strands of an active strike-slip fault
Geologic fault
In geology, a fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement along the fractures as a result of earth movement. Large faults within the Earth's crust result from the action of tectonic forces...

. The relative motion of the two fault strands results in a stretching of the land between them, causing the land between them to sink.

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