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26 Cards in this Set
- Front
- Back
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Fossil
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The preserved remains or traces of living things. |
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Extinct
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Describes a type of organisms that no longer exists anywhere on earth. |
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Half-life
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The length of time, needed for half the atoms of a sample and a radioactive isotope to decay. |
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Sedimentary Rock
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The type of rock that is made of hardened sediment. |
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Relative age
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The age of a rock compared to the ages of rock layers. |
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Era
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One of three long units of Geologic Time into which geologists divide between the Precambrian and the present. |
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Mold
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A fossil formed when an organism buried in sediment dissolved's leaving a hollow area. |
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Absolute age
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The age of rock given as the number of years the rock formed. |
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Period
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Units of Geologic Time that scientists divide Eras. |
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Cast
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A fossil that is a copy of an organisms shape formed when minerals seep into mold. |
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Extrusion
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An ingenuous rock layer formed when lava flows onto earths surface. |
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Law of superposition
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The geological principle that states that in horizontal layers of sedimentary rock, each layer younger than the layer below. |
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Petrified fossil
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A fossil in which minerals replace all of part of an organism. |
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Intrusion
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An ingenuous rock layer formed when magma happens beneath earth's surface. |
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Geologic time scale
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A record of the geological events and life forms in earths history. |
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Evolution
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The process by which all the different kinds of living things have changed over time. |
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Radioactive decay
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The breaking down of radioactive element, releasing partials and energy. |
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Paleontologists
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A scientist who study fossils to learn about organisms that lived long ago. |
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Geology |
the science that deals with the earth's physical structure and substance, its history, and the processes that act on it |
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Igneous Rock |
Rock that is formed through the cooling and solidification of magma or lava |
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Ice Core |
Long cylinder of glacial ice recovered by drilling through glaciers in Greenland, Antarctica, and high mountains around the world |
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Index Fossil |
Any animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time or environment |
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Uplift |
Vertical elevation of the Earth's surface in response to natural causes |
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Unconformity |
Buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous |
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Breaking |
A crack in the earth's crust resulting from the displacement of one side with respect to the other |
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Folding |
A wave-like geologic structure that forms when rocks deform by bending instead of breaking under compressional stress |
