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fossils

QuestionAnswer
the preserved remains/traces of living things fossil
the type of rock that is made of hardened sediment sedimentary rock
a hallow area in sediment in the shape of an organism or part of an organism. mold
a solid copy of the shape of an organism cast
fossils in which minerals replace all or part of an organism petrified fossil
an extremely thin coating of carbon on rock carbon film
provide evidence of the activities of ancient organisms trace fossils
scientists who study fossils paleontologists
a well tested concept that explains a wide range of observations scientific theory
a type of organism that no longer exists and will never again live on earth extinct
a rock's age compared to the ages of other rocks relative age
a rock's number of years since the rock formed absolute age
used to determine that relative ages of sedimentary rock layers law of superposition
lava that hardens on the surface extrusion
an igneous rock layer formed when magma hardens beneath earth's surface intrusion
the surface where new rock layers meet a much older rock surface beneath them unconformity
a fossil must be widely distributed and represent a type of organism that existed only briefly index fossil
a break in earth's crust fault
all the matter you see, including rocks, is made of these tiny particles atom
when all the atoms in a particular type of matter are the same, the matter is this element
over time, elements break down, or decay, by releasing particles and energy in this process radioactive decay
of a radioactive element is the time it takes for half of the radioactive atoms to decay half life
Created by: alice670
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