3 Indianapolis Public Schools Substitute Teacher Salaries. Indianapolis Public Schools Substitute Teachers earn $30,000 annually, or $14 per hour, which is equal to the national average for all Substitute Teachers at $30,000 annually and 68% lower than the national salary average for âall working Americans.
Metamorphic grade is a general term for describing the relative temperature and pressure conditions under which metamorphic rocks form. As the temperature and/or pressure increases on a body of rock we say that the rock undergoes prograde metamorphism or that the grade of metamorphism increases.he original rock that has undergone metamorphism is called the protolith. Protolith can be any type of rock and sometimes the changes in texture and mineralogy are so dramatic that is difficult to distinguish what the protolith was.
This process is called metamorphism, and the resulting rocks are called metamorphic rocks, which means changed or altered rocks. By metamorphism, granite has often been changed to gneiss, the pressure having caused the granite to squeeze out or flow, so as to develop a somewhat stratified appearance, conspicuous minerals like black mica having been pressed out and gathered into layers of concentration.