Quizlet

Term	Definition
continental glacier	glacier that covers continent
vertebrate	animal with backbone
Pangea	supercontinet that broke apart 200 million years a go
fossil	trace of organism preserved in rocks
atom	central nucleus surrounded by an electron cloud
amphibian	vertebrate that lives on land and water
drift	when conteinits move
big bang	initital explosion formed by the universe
decay	when atoms brake down into an different form
ice age	period in time when much of the earth was covered by glaciers
oxygen	is made of oxygen and it helps block ultravioliet rays
66 million years a go	many animals including dinosaurs become extinct
milky way	what is the name of our galaxy
element	the smallest particle which all atoms are the same
geologic time scale	a reccord of the geological time into which geoloist divides into areas
reptiles	a vertebrate with scaly skin that lays eggs with tough scales
mammal	warm blooded vertebrate that feeds it young
law superpostion	tge geologic princeple that states layers of edimtary rock
absolute age	the age of rock given as the number of years science the rock formed
period	one unit of geological tiem into which geologist divide into areas
invertebrate	Animal with no back bone
comet	a loose conection of ice dust and small rocky particles
plasma	warm gas
liquid	water
gas

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