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16 terms

evolution

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fossils
the perserved trace, imprint, or remains of a plant or animal
petrification
the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape
mold
shape or influence
tetrapod
A vertebrate possessing two pairs of limbs, such as amphibians, reptiles, birds, and mammals.
cast
cast
a type of body fossil that forms when crystals fill a mold or sediments wash into a mold and harden into rock
imprints
shallow prints or marks in rocks
tarpit
Hollow in the ground in which natural tar accumulates by seepage.., Hollow in the ground in which natural tar accumulates by seepage
amber
a deep yellow color
lead
a soft heavy toxic malleable metallic element
trace fossil
a type of fossil that provides evidence of the activities of ancient organisms
evolved
to develop gradually by process of growth and change
uranium
uranium
a white, radioactive metallic chemical element that weighs more than any other element in nature.
bipedal
having two feet
Radioactive dating
technique in which scientists calculate the age of a sample based on the amount of remaining radioactive isotopes it contains
geologic time scale
a chronological arrangement of geologic time subdivided into units
Paleontologist
a scientist who studies fossils to learn about organisms that lived long ago