16 terms

Terms	Definitions
Fossil	The preserved remains or traces of an organism that lived in the past
Petrification	gradual change of the original substances of an organism dissolve and are replaced by minerals from the water (turned to stone)
Mold	a type of fossil formed when a shell or other hard part of an organism dissolves, leaving an empty space in the shape of the part
cast	A type of fossil that forms when a mold becomes filled in with minerals that then harden.
Amber	hardened tree sap
imprints	Thin object falls into sediment can leave an imprint when sediment hardens.
tar pit	Formed when a dark sticky form of oil seep up from underground causing animals to get stuck
trace fossil	a type of fossil that provides evidence of the activities of ancient organisms
tetrapod	a vertebrate animal having four feet or legs or leglike appendages
paleontologist	scientist who studies fossils
evolved	to develop gradually by process of growth and change
bipedal	term used to refer to two-footed locomotion
geologic time scale	scale used by paleontologists to represent evolutionary time
radioactive dating	measurement of the amount of radioactive material (usually carbon 14) that an object contains
uranium	a heavy toxic silvery-white radioactive metallic element
lead	The metal created from aged uranium

Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com. Click to see the original works with their full license.

• "Fossil" image
• "Petrification" image
• "Mold" image
• "cast" image
• "Amber" image
• "imprints" image
• "tar pit" image
• "trace fossil" image
• "tetrapod" image
• "paleontologist" image
• "evolved" image
• "bipedal" image
• "geologic time scale" image
• "radioactive dating" image
• "uranium" image
• "lead" image

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