Ivack 6th Chapter 10

12 cards·by livack

older rocks are found on the

bottom

younger rocks are found on the

top

(relative/absolute) age is an exact age

absolute

radioactive dating is used to find the _______ age

absolute

scientists who study fossils

paleontologists

fossils that form when minerals replace parts of an organism

petrified fossil

hollow part of a fossil

mold

solid copy of an organisms

cast

fossils usually form in _________ rock

sedimentary

footprints are examples of _______fossils

trace

_______ fossils are widely distributed

index

time it takes for half of an element to decay

half-life