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earth and evolution

vocabulary

TermDefinition
1.fossil the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
2.relative age old or younger comparing ages
3.absolute age age of one object compared to the age of another object
4.law of superpositions The law of superposition is an axiom that forms one of the bases of the sciences of geology, archaeology, and other fields dealing with geological stratigraphy. s
5.index fossil certain fossils widely distributed existed only a brief period of time
6.radioactive decay also known as nuclear decay, radioactivity or nuclear radiation
7.geologic time scale The geologic time scale is a system of chronological dating that relates geological strata to time
8.extinct having no living members.
9.intrusion the action of intruding.
10.fault criticize for inadequacy or mistakes.
11.unconformity a surface of contact between two groups of unconformable strata
12.Pangaea Pangea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras.
13.mechanical weathering is the process of breaking big rocks into little ones. This process usually happens near the surface of the planet.
14.chemical weathering the erosion or disintegration of rocks, building materials, etc., caused by chemical reactions (chiefly with water and substances dissolved in it) rather than by mechanical processes.
15.continental drift the gradual movement of the continents across the earth's surface through geological time
16.evolution the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.
17.natural selection the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.
18.genetics the study of heredity and the variation of inherited characteristics.
19.adaptation a change or the process of change by which an organism or species becomes better suited to its environment.
20.variation a change or difference in condition, amount, or level, typically with certain limits
21. anatomy the branch of science concerned with the bodily structure of humans, animals, and other living organisms, especially as revealed by dissection and the separation of parts.
22. uniformitarianism Changes in the Earths crust have been caused by uniform processes.
Created by: lken0713
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