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science chapter 10

flashcards chapter 10 lesson 1, 2 and 3

TermDefinition
fossils the preserved remains or evidence of ancient living things
catastrophism the idea that conditions and organisms on Earth change in quick, violent events
uniformitarianism states that geologic processes that occur today are similar to those that have ocurred in the past
carbon film the fossilized carbon outline of an organism or part of an organism
mold the impression in a rock left by an ancient organism
cast a fossil copy of an organism made when a mold of the organism is filed with sediment or mineral deposits
trace fossil the preserved evidence of the activity of an organism
paleontologists scientists who studies fossils
relative age the age of rocks and geologic features compared with other rocks and features nearby
superposition the principle that in undisturbed rock layers, the oldest rocks are on the bottom
inclusion a piece of an older rock that becomes part of a new rlock
unconformity a surface where rock has eroded away, producting a break, or gap, in the rock record
correlation matching rocks and fossils from separate locations
index fossils represent species that existed on Earth for a short length of time, were abundant, and inhabited many locations
absolute age the numerical age, in years, of a rock or object
isotopes are atoms of the same element that have different numbers of neutrons
radioactive decay the process in which an unstble element naturally changes into another element that is stable
half-life the time required for half of the parent isotopes to decay into daughter isotopes
Popular Earth Science sets

 



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