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A paleontologist is a scientist that studies fossils.

Types of Fossils There are two main types of fossils: body fossils and trace fossils.

Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element.

There's a small amount of radioactive carbon-14 in all living organisms.

The carbon-14 it contained at the time of death decays over a long period of time.The object's approximate age can then be figured out using the known rate of decay of the isotope.For organic materials, the comparison is between the current ratio of a radioactive isotope to a stable isotope of the same element and the known ratio of the two isotopes in living organisms.A body fossil is the physical remains of an animal. Some very small organisms, called microbacteria, leave behind microscopic particles called filaments.Geologists often need to know the age of material that they find.Isotopes are atoms with the same number of protons and electrons, but a different number of neutrons. These are the elements that we see around us and find in nature. Radioactivity is measured using a unit called the "curie". The curie measures how many atoms spontaneously decay each second.