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Earth History Unit
Terms in this set (35)
geologic time scale
A record of the geologic events and life forms in Earth's history.
Law of Superposition
The top rock layer and its fossils is the youngest and the bottom is the oldest.
A preserved remnant or impression of an organism that lived in the past.
length of time required for half of the radioactive atoms in a sample to decay
A scientist who studies fossils
a 3-D fossil formed when a fossil imprint fills with minerals and hardens
a hollow fossil imprint in sedimentary rock
when a paleontologist compares two fossils and determines which is younger and which is older
when a paleontologist gives an approximate age in years of a fossil
a radioactive isotope of carbon
of, relating to, or denoting the earliest eon, preceding the Cambrian period and the Phanerozoic eon
a particular period in history
the oldest era - immediately after Precambrian; organisms developed hard parts
Age of reptiles
Age of mammals
The name of the single landmass that broke apart 200 million years ago and gave rise to today's continents
A break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time.
A type of unconformity in which layered sedimentary rocks lie on an erosion surface cut into igneous or metamorphic rocks
A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together
A term that typically describes a species that no longer has any known living individuals.
The hypothesis that the continents slowly move across Earth's surface.
A theory stating that the earth's surface is broken into plates that move.
portion of Earth's crust that lies beneath ocean waters
A process by which new land is created when sea plates pull apart and magma wells up between the plates
A plate boundary where two plates move toward each other.
A plate boundary where two plates move away from each other.
A change in a gene or chromosome.
A natural process resulting in the evolution of organisms best adapted to the environment.
Structures in different species that are similar because of common ancestry.
Body parts that share a common function, but not structure
A layer of rock that is not longer even because it has been broken up because of destructive processes
the bending of rock layers due to stress in the Earth's crust, such as seismic waves
a layer of rock that forms when magma or lava intrudes through layers of rock and hardens
fossils that form in sedimentary rock and tell us they are as old as the rock layer they are found in
A break in the earth's crust that forms because of internal processes such as seismic waves
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