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geology
| Term | Definition |
|---|---|
| fossil | the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock. |
| index fossil | are fossils used to define and identify geologic periods (or faunal stages). |
| permineralized remains | process of fossilization in which mineral deposits form internal casts of organisms. |
| molds & casts | Molds and casts are three dimensional and preserve the surface contours of the organism. |
| original remains | Minerals replace the remains, forming a fossil of the hard skeletal body parts. Other fossils are impressions or other evidence of an organism preserved in rock. |
| trace fossils | indirect evidence of life in the past, such as the footprints, tracks, burrows, borings, and feces left behind by animals, rather than the preserved remains of the body of the actual animal itself. |
| relative age | Relative dating is the science of determining the relative order of past events (i.e., the age of an object in comparison to another), without necessarily determining their absolute age, (i.e. estimated age). |
| superposition | principle of quantum theory that describes a challenging concept about the nature and behavior of matter and forces at the sub-atomic level. |
| horizontality | Original Horizontality states that layers of sediment are originally deposited horizontally under the action of gravity . |
| absolute age | Absolute age is the true age of a rock or fossil. |
| half life | Half-life is the amount of time required for the amount of something to fall to half its initial value. |
| isotopes | each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element |
| radioactive decay | Radioactive decay, also known as nuclear decay or radioactivity, is the process by which a nucleus of an unstable atom loses energy by emitting radiation. |
| geologicic time | geological time is a system of chronological measurement that relates stratigraphy to time, and is used by geologists, paleontologists, and other scientists to describe the timing and relationships between events that have occurred throughout history. |
| eon | an indefinite and very long period of time, often a period exaggerated for humorous or rhetorical effect. |
| era | a long and distinct period of history with a particular feature or characteristic. "his death marked the end of an era" |
| period | a length or portion of time. |
| epoch | a period of time in history or a person's life, typically one marked by notable events or particular characteristics. |
| 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. |
| trilobite | an extinct marine arthropod that occurred abundantly during the Paleozoic era, with a carapace over the forepart, and a segmented hind part divided longitudinally into three lobes. |
| precambrian | of, relating to, or denoting the earliest eon, preceding the Cambrian period and the Phanerozoic eon. |
| mesozoic | includes the Triassic, Jurassic, and Cretaceous Periods and is characterized by the development of flying reptiles, birds, and flowering plants and by the appearance and extinction of dinosaurs. See Table at geologic time. |
| cenozoic |
Created by:
aidanhelfrich
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