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Earth History Study Guide
Terms in this set (28)
Preserved remains of once-living organisms
a fossil that is the actual body or body parts of an organism
A principle that geologic processes that occurred in the past can be explained by current geologic processes
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 rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together
A type of rock that forms from the cooling of molten rock at or below the surface.
a type of igneous rock that generally contains large crystals and forms when magma cools slowly beneath Earth's surface.
event in which many types of living things become extinct at the same time
law of superposition
The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it.
A type of fossil that is an imprint from organisms without hard parts
Theory of plate tectonics
The theory that pieces of Earth's outer layer are in constant motion
cast and mold
an impression(cast) of an organism is left in rock and is filled by different stone(mold)
An increase in the average temperature of the earth's atmosphere (especially a sustained increase that causes climatic changes)
fine-grained igneous rock that forms when magma cools quickly at or near Earth's surface
a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found
pieces of ice used to track earths past weather
A lack of explanation for continental drift prevented many scientists from accepting that a single super continent called ________ once existed.
A subdivision of the mantle situated below the lithosphere. This zone of weak material exists below a depth of about 100 kilometers and in some regions extends as deep as 700 kilometers. The rock within this zone is easily deformed.
(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
a scientist who studies fossils
Process of estimating age of once living material by measuring the amount of radioactive isotope of carbon present in material.
continental drift theory
Alfred Wegener believed landmasses of Earth once fit together to form single landmass called "Pangaea"; landmasses "drifted" to where they are today; theory disregarded due to lack of evidence
along with living organisms, shaped the physical features of the planet
geologic time scale
scale used by paleontologists to represent evolutionary time
tree growth is influenced by climate conditions, patterns in tree rings and isotopic composition of materin within each ring reflect variations in past climate
how earth/land has changed over time
A type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions.
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