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Science Word List v3

edited by Anonymous

Science Vocab

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Words used in this Word List

#	Science Vocab	Definition
1	Paleontology	the study of anciet life forms
2	Evolution	the change in species over time
3	Chemical Weathering	process by which rocks & minerals undergo changes in their composition
4	Unconformity	gap in the rock record
5	Mass Extinction	occurs when an unusally large # of organisms disappear
6	Geologic Time Scale	record of Earth~q1s history from its origin
7	Extrusive	fine-grained igneous rock that is formed when molten rock cools slowly and solidifies inside Earth~q1s surface
8	Geology	study of materials that make up Earth
9	Intrusive	coarse-grained igneous rock that is formed when molten rock cools slowly
10	Contact Metamorphism	local effect that occurs when molten rock meets solid rock
11	Granitic Rock	light-colored rock that has high silicia content
12	Deposition	occurs when sediments are laid down on the ground or sink to the bottom f a body of water
13	Metamorphic Rock	rock alteres by pressure and heat
14	Nonfoliated	matamorphic rocks like quartize and marble, composed mainly of minerals that form with blocky crystal shapes
15	Igneous Rock	intrusive or extrusive rock formed from he cooling & crystallization of magma or lava.
16	Foliated	metamorphic rock whose minerals re squeezed under high pressure & arranged in wavy layers and bonds
17	Basaltic Rock	dark-colored rock has lower silica content
18	Cementation	process of sedimentary rock formation that occurs when dissolving minerals precipitate out of ground water
19	Sedimentary Rock	rock that has formed from consolidated clay sediments
20	Compaction	the consolidation of sediments resulting from the weight of overlying deposits
21	Sediments	solid particles deposited on Earth~q1s surface that can form sedimentary rocks
22	Mechanical Weathering	process that breaks down rocks and minerals into smaller pieces but doesn~q1t involve any change in their composition
23	Magma	molten material found eneath Earth~q1s crust that flows minerals with large crystals when it cools slowly
24	Weathering	chemical or mechanical process that breaks down and changes rocks on or near Earth~q1s surface
25	Lava	magma that lows out into Earth~q1s surface
26	Erosion	movement of wearthered materials from one location to another
27	Rock Cycle	continuous, dynamic set of processes by which rocks are changed into other types of rock
28	Correlation	matching of rock outcrops of one geographic region to another
29	Index Fossils	remains of plants r animals that can be used by geologists
30	Half Life	the time required for one-half of a radioisotope~q1s nuclei to decay into its products
31	Radioactive Decay	emmisions of radioactive particles and its resulting change
32	Radioactive Isotopes	an element with an unstable nuclei
33	Absolute Dating	method that enables scientists to determine the actual age of certain rocks and other objects
34	Relative Dating	establishing the order of past geological events
35	Crosscutting Relationship	the principle that an intrusive is younger than the rock it cuts across
36	Superposition	the principle that the oldest rocks are on the bottom
37	Original Horizontality	the principle that sedimentary rocks are deposited in horizontal layers
38	Geologic Column	record of Earth~q1s history from its origin 4.6 bya to the present
39	Epoch	time unit in the geological time scale smaller than a period
40	Period	third longest time unit
41	Era	second longest time unit
42	Eon	longest time unit in the geological time scale

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