How thick is a single pane glass window typically? I recently broke the window in my dorm. I was resting my foot on the window, and it just broke underneath. I measured the thickness of the broken window, and found it only to be an eighth inch. I feel almost like I should be the one complaining... Source(s): average window thickness: https://bestanswer.im/e14/average-window-thickness.
By Andrew Alden. Metamorphic rocks are the third great class of rocks. These are what happens when sedimentary and igneous rocks become changed, or metamorphosed (changed in form), by conditions underground. The four main agents that metamorphose rocks are heat, pressure, fluids and strain.
Metamorphic Rocks. Metamorphic rocks form through the transformation of other rocks. This change is caused by heat and pressure acting upon the original rock (igneous, sedimentary, or metamorphic) and altering the rock's mineral structure and/or composition. 1  regional metamorphism - The large-scale transformation of rock that results from mountain-building and other forms of crustal movement.