Here are the terms matched to their correct definitions:
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Law of Superposition
- The geological principle that states that in undisturbed layers of rock, younger rocks lie above older rocks.
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Index Fossil
- A fossil that is used to define and identify a particular time period in the geologic time scale; these fossils are typically widespread but only existed for a short duration.
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Continental Drift
- The theory that the continents have moved over geological time and were once connected as a single landmass.
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Half-Life
- The time required for half of the radioactive atoms in a sample to decay; a measure used in radiometric dating.
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Sonar
- A technique that uses sound navigation and ranging to locate and identify objects underwater, commonly used for mapping the ocean floor.
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