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Thingie

Unit

TermDefinition
Amber fossilized tree resin
Fossil the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
Cast cause (light or shadow) to appear on a surface.
Index fossil fossils used to define and identify geologic periods
Mold a furry growth of minute fungal hyphae occurring typically in moist warm conditions, especially on food or other organic matter.
Permineralization process of fossilization in which mineral deposits form internal casts of organisms.
Trace fossil Trace fossils provide us with 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.
Cross-cutting relationships used to determine the relative ages of rock strata and other geological structures.
Geologic time system of chronological measurement that relates stratigraphy to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships between events that have occurred throughout Earth's history.
Lateral continuity The principle of lateral continuity states that layers of sediment initially extend laterally in all directions; in other words, they are laterally continuous. As a result, rocks that are otherwise similar, but are now separated by a valley or other erosi
Orginal horizontality The Principle of Original Horizontality states that layers of sediment are originally deposited horizontally under the action of gravity . It is a relative dating technique. The principle is important to the analysis of folded and tilted strata.
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 Superposition is a principle of quantum theory that describes a challenging concept about the nature and behavior of matter and forces at the sub-atomic level.
Unconformity An unconformity is a contact between two rock units in which the upper unit is usually much younger than the lower unit. Unconformities are typically buried erosional surfaces that can represent a break in the geologic record of hundreds of millions of ye
Uniformitarianism Uniformitarianism is the assumption that the same natural laws and processes that operate in the universe now have always operated in the universe in the past and apply everywhere in the universe. It has included the gradualistic concept that "the present
Absolute Age Absolute age is the true age of a rock or fossil.
Half-life amount of time required for the amount of something to fall to half its initial value.
Ice core core sample that is typically removed from an ice sheet, most commonly from the polar ice caps of Antarctica, Greenland or from high mountain glaciers elsewhere.
Isotope Each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range in its number of neutrons. The number of nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotop
Radiometric dating Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they formed.
Differentiation the action or process of differentiating.
Outgassing release or give off (a substance) as a gas or vapor.
Supercontinent the assembly of most or all of the Earth's continental blocks or cratons to form a single large landmass
Pangaea supercontinent that existed during the late Paleozoic and early Mesozoic eras.
Orogeny a process in which a section of the earth's crust is folded and deformed by lateral compression to form a mountain range.
Evolution change in the heritable traits of biological populations over successive generations
Natural Selection Natural selection is one of the basic mechanisms of evolution, along with mutation, migration, and genetic drift.
Created by: 3050112
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