Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means "change in form". The protolith is subjected to heat and ...

A RICH store of observations especially on the metamorphic rocks of Great Britain, numerous excellent drawings of rock sections as seen in the microscope and admirable clarity of statement are the ...

Rock is a solid mass of minerals that have joined together over time. Geology is the study of how the Earth is formed and the things that happen to the Earth. As part of this, geologists study rocks ...