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    A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.However, by itself a fossil has little meaning unless it is placed within some context.

    As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.

    Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.

    Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

    those that form during chemical reactions without breaking down).

    The unstable or more commonly known radioactive isotopes break down by radioactive decay into other isotopes.

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