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.
Summary. 1  Any type of rockâigneous, sedimentary, or metamorphicâcan become a metamorphic rock. 2  Heat and pressure form metamorphic rocks. 3  Magma can cause existing rocks to change into metamorphic rocks. 4  Metamrophic rocks can be classified by their texture: foliated, nonfoliated.eat and/or pressure then change the rock into a metamorphic rock. The change can be physical, chemical, or both. Think of the inside of the Earth is like an oven. The Earth bakes the rocks and chemically changes the minerals inside them.