Talk:High School Earth Science/Metamorphic Rocks

why are metamorphic rocks better for statues than sedimentary rocks? my science homework question


 * Metamorphic rocks start off as igneous, sedimentary, or other metamorphic rocks. These rocks are changed when heat or pressure alters the existing rock's physical or chemical make up. One ways rocks may change during metamorphism is by rearrangement of their mineral crystals. When heat and pressure change the environment of a rock, the crystals may respond by rearranging their structure. They will form new minerals that are more stable in the new environment. For a statue, this means the new structure is more resilient in standing up to erosion from wind, rain, and pollution.  A sedimentary rock is formerly sand and so it will wear away easily when exposed to the elements over time. – Adrignola talk 17:48, 3 October 2010 (UTC)