Metamorphic rock the foliation is called "gneissosity"), granoblastic (includes granulite, some marbles and quartzite), and hornfelsic (includes hornfels and skarn). Metamorphic rock Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure ( or more), causing profound physical or chemical change. The protolith may be a sedimentary, igneous, or existing metamorphic rock. Metamorphic rocks make up a large part of the Earth's crust and form 12% of the Earth's land surface. They are classified by
Black Slate been working on a new album, "Now And Then", for an official 2015 release on TCD Records. A peaceful Demonstration is what we need. However this totally amazing album created by Black Slate is causing a Riot in the musical streets of the city of London where it all started some FORTY odd years ago; thus making Black Slate the first official Roots Rock Reggae Band out of "Great Britton" That’s right; gallantly forging forward in the name of music, every track on this album expresses a musical form in a unique story of the Good, the Better and the