Water can crack rock.

Water can indeed crack rock through physical processes such as mechanical weathering and freeze-thaw cycles.

At a glance

Key Evidence

Verified July 30, 2025

Water seeps into cracks in rocks and freezes, expanding by about 10%, which exerts pressure that can crack the rock.education.nationalgeographic.org bgs.ac.uk
Repeated freeze-thaw cycles gradually pry rocks apart.opengeology.org ck12.org
Flowing water can also physically erode rock surfaces over time.medium.com

The reporting

What the Evidence Shows

The statement that water can crack rock is supported by well-established geological processes. Mechanical weathering, also known as physical weathering, involves the breakdown of rocks without changing their chemical composition. Water plays a key role in this process by seeping into cracks and crevices in rocks.

When temperatures drop below freezing, the water inside these cracks freezes and expands, exerting pressure on the rock walls. This expansion can widen existing cracks and eventually cause the rock to fracture and break apart. This process is commonly referred to as frost wedging or ice wedging.

Additionally, flowing water can erode rock surfaces over time by abrasion and hydraulic action, further contributing to rock breakdown. These mechanisms are widely recognized in geology and are supported by multiple authoritative sources.

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