Changes in Geology Over Time Flashcards

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Superposition

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The principle that in a series of rocks the youngest layer is on top and the oldest is on the bottom.

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Era

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A major stitch of time in Earth's geologic history.

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Fossil

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The remains or impression of an organism preserved in Earth's crust.

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Half-life

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Described as the time it takes for half the mass of an original element to change into a new product.

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Absolute Age

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The exact age of a rock or fossil. (For example: Kyle is 16 years old)

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Period

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A shorter section of time that an era is divided into.

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Geologic Column

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A list of rock layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom

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Precambrian

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The earliest part of Earth's history which lasted about 4 billion years.

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Mesozoic

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An era of geological time known as the age of reptiles, including dinosaurs.