Commitment Bonus â This has to do with the total amount of classes taught in the month long pay period. If you teach less than 30 classes a month there is no bonus. If you teach 30-45 classes in a pay period, you receive a $.50 per class bonus.
There are four primary types of fossils: mold fossils, cast fossils, trace fossils and true form fossils. Cast fossils are formed when the imprints created by fossils, called mold fossils, are filled in by minerals over time. Definition of Cast Fossils. A cast fossil is a type of fossil indicator.
A petrified log in Arizona is an example of permineralization. Mold fossils and cast fossils occur when an organism leaves an imprint that is fossilized. Mold fossils are when an imprint is made and that imprint is fossilized, whereas cast fossils are imprints that are filled in and then fossilized. This is a mold fossil of a bivalve, like a clam or oyster, from a dig sight in Ohio