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Chapter 6 Vocab

Across
Radioactive _______ - radioactive isotopes break
______ fossils - fossil found in rock layers of only one geological age and can be used to establish the age of the rock layers
Atom that has the same number of protons but different number of neutrons
The time needed for a half sample of a radioactive substance to decay
Geologic processes that occurred in the past can be explained by the present
______ column
The scientific study of fossils
Geologic ______ ______ - standard method used to divide the Earth's long natural history into manageable parts
_____ dating - determining age of an object using radioactive isotopes.
Largest subdivision of the geologic time scale
Down
Mark or cavity made in sedimentary surface by a shell or other body
Missing pieces in the geologic record
_____ dating - method of measuring the age of an event or object in years
Death of every member of a species
Smallest subdivision of the geologic time scale
___ dating - method of determining the order of objects or events
Principle that stats younger rocks lie above older rocks
Remains of an organism preserved by geological processes
Type of fossil that forms when sediments fill in the cavity left by a decomposed organism
_____ fossil - mark formed in soft sediment by the movement of an animal