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| A break or crack in Earth’s lithosphere along which the rocks move. |
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| A place where an old, eroded rock surface is in contact with a newer rock layer. |
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| An igneous rock layer formed when lava flows onto Earth’s surface and hardens. |
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| Fossils of widely distributed organisms that lived during only one short period. |
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Definition
| The age of a rock compared to the ages of rock layers. |
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| The age of a rock given as the number of years since the rock formed |
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| The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it. |
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Definition
| An igneous rock layer formed when magma hardens beneath Earth’s surface |
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