Set: Fossils

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With group: Mountain View Science 9
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All 15 terms

TermDefinition
carbonaceous filmcarbon deposit
relative ageapproximate age
fossilremains of a once living organism
radioactivitybreakdown of unstable isotopes into stable atoms
moldimprint of a once living organism
isotopevariation in number of neutrons
original remainsamber or frozen remains
petrified remainsremains replaced by minerals
law of superpositionoldest rock layers are under younger ones
castsediments fill a mold
half-lifeamount of time for half of a substance to breakdown
trace fossilfootprints or animal tracks
fossil fuelsnatural gas, oil and coal
index fossilorganism that lived in a wide area for a short time
absolute ageexact age

Set Information

Terms 15
Creator ladykelso
Created April 30, 2008
Group Mountain View Science 9
Subjects None
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Most Missed Words

  1. petrified remains remains replaced by minerals - 69 misses
  2. carbonaceous film carbon deposit - 63 misses
  3. mold imprint of a once living organism - 56 misses
  4. original remains amber or frozen remains - 56 misses
  5. radioactivity breakdown of unstable isotopes into stable atoms - 52 misses
  6. law of superposition oldest rock layers are under younger ones - 52 misses
  7. index fossil organism that lived in a wide area for a short time - 52 misses