Unit 6 Geological Time - Sheridan Lee
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| Amber | fossilized tree resin
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| Fossil | the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
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| Cast | an object made by shaping molten metal or similar material in a mold
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| Index Fossil | a fossil that is useful for dating and correlating the strata in which it is found.
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| Mold | a distinctive and typical style, form, or character.
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| Permineralization | process of fossilization in which mineral deposits form internal casts of organisms
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| Trace fossil | a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
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| Cross-cutting relationships | states that an igneous intrusion is always younger than the rock it cuts across
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| Geologic time | a system of chronological measurement that relates stratigraphy to time
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| Lateral Continuity | states that layers of sediment initially extend laterally in all directions; in other words, they are laterally continuous
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| Original horizontality | states that layers of sediment are originally deposited horizontally under the action of gravity
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| Relative age | common practice for dating rocks, science of determining the relative order of past events
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| Superposition | principle of quantum theory that describes a challenging concept about the nature and behavior of matter and forces at the sub-atomic level.
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| Unconformity | a surface of contact between two groups of unconformable strata.
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| Uniformitarianism | the theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.
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| Absolute Age | the true age of a rock or fossil
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| Half-life | he time taken for the radioactivity of a specified isotope to fall to half its original value.
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| Ice core | a core sample that is typically removed from an ice sheet
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| Isotope | help determine the chemical composition and age of minerals and other geologic objects.
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| Radiometric dating | any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.
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| Differentiation | The geological process by which the Earth came to have its present interior structure
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| Outgassing | To remove embedded gas from (a solid), as by heating or reducing the pressure
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| Supercontinent | each of several large landmasses (notably Pangaea, Gondwana, and Laurasia) thought to have divided to form the present continents in the geological past.
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| Pangaea | hypothetical supercontinent that included all current land masses, believed to have been in existence before the continents broke apart during the Triassic and Jurassic Periods.
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| Orogeny | a process in which a section of the earth's crust is folded and deformed by lateral compression to form a mountain range.
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| Evoluation | the gradual development of something, especially from a simple to a more complex form.
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| Natural selection | the process by which plants and animals that can adapt to changes in their environment are able to survive and reproduce while those that cannot adapt do not survive
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