Fossils I
Fossils II
Relative Dating I
Relative Dating II
Radioactive Dating
100
Preserved remains of traces of living things.
What is fossil
100
An extremely thin coating of carbon on rock.
What is carbon film.
100
When an organism no longer exists and will never again on earth.
What is extinct.
100
A mass of igneous rock beneath the surface.
What is intrusion.
100
When all the atoms in a type of matter are the same.
What is element
200
Type of rock that is made of hardened sediment where most fossils are found
What is sedimentary rock
200
Provides evidence of the activities of ancient organisms.
What is trace fossil.
200
A rock's age compared to ages of other rocks.
What is relative age.
200
A break in the Earth's crust.
What is fault
200
The time it takes for half of the radioactive atoms to delay.
What is half-life.
300
A hollow area in sediment in the shape of an organism or part of an organism.
What is mold
300
A scientist that studies fossils.
What is paleontologist.
300
The number of years since the rock formed.
What is absolute age.
300
The surface where new rock layers meet a much older rock surface beneath them.
What is unconformity.
300
A record of the life forms and geologic events in Earth's history.
What is geologic time scale.
400
A solid copy of an organism.
What is cast.
400
A well tested concept that explains a wide range of observations.
What is scientific theory
400
In horizontal sedimentary rock layers, the older layer is at the bottom and the younger layers are at the top.
What is law of superposition.
400
A fossil that is widely distributed and represent a type of organism that existed briefly.
What is index fossil.
400
Basic unit of geologic time from Precambrian time to present.
What is era.
500
Fossil in which minerals replace all or part of an organism.
What is petrified fossil
500
A gradual change in living things over long periods of time.
What is evolution
500
Lava that hardens on the surface.
What is extrusion.
500
Tiny particles that make up all matter.
What is atom
500
Eras subdivided into units of geologic time.
What is period.
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