Radience

Fossils and Extinction 3-LS4-1

NGSS

cast

a fossil formed when dissolved minerals fill a mold and harden
cast Simple Definition

fossil

the preserved traces and remains of an organism that lived long ago
fossil Simple Definition

fossil record

the history of life recorded by all the fossils we have collected
fossil record Simple Definition

index fossil

a fossil from an organism that existed for a short time, it is used to determine the age of other fossils
index fossil Simple Definition

mold

a rock fossil created when a buried organism dissolves
mold Simple Definition

trace fossil

a fossil formed in soft sedimentary rock, like a footprint
trace fossil Simple Definition

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