Subsequent periglacial frost wedging during the Pleistocene formed the hill's extensive boulders. The V-groove transmits torque through a wedging action, thus increasing friction. Additionally, flakes may be initiated in a Hertzian, bending, or wedging fashion. Idiopathic causes, such as vertebral wedging or other abnormalities, can be confirmed through X-ray. They use three main methods of burrowing; bulldozing, wedging and boring. In addition to frost wedging, rain is another weathering process causing erosion. Wedging initiation is the result of a strong hammer blow. The chamber is thus made of 15 flagstones and two wedging stones. For example, the primary weathering force at Bryce Canyon is frost wedging. But wedging his gun under his left armpit, he continues firing and staggers forward. Other second order processes include tidal and seismic events, buoyant forces and melt water wedging. This all-or-nothing rule is the premise for orthotic posting or wedging. Other wedging stones are probably still buried. Wedging can also help produce an even moisture content.