How can we help?

You can also find more resources in our Help Center.

15 terms

Fossils

STUDY
PLAY
carbonaceous film
carbon deposit
relative age
approximate age
fossil
remains of a once living organism
radioactivity
breakdown of unstable isotopes into stable atoms
mold
imprint of a once living organism
isotope
variation in number of neutrons
original remains
amber or frozen remains
petrified remains
remains replaced by minerals
law of superposition
oldest rock layers are under younger ones
cast
sediments fill a mold
half-life
amount of time for half of a substance to breakdown
trace fossil
footprints or animal tracks
fossil fuels
natural gas, oil and coal
index fossil
organism that lived in a wide area for a short time
absolute age
exact age