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geoscience final dr.vice
Terms in this set (15)
The study of rock layers
a mapable unit, and unified group of rock,
igneous, metamorphic, sedimentary
A gap in the geologic record that shows where rock layers have been lost due to eroison.
indicates period of mountain building
how old a rock is compared to another rock. the youngest rock layer are on the top layer.
sedimentry rocks deposited in horizontal sheets
when a sandstone is broken and bent they have history before it is deposited in the horizontal sheets
inclusions and cross-cutting dikes
Crosscutting Relations are those where one rock literally cuts across another, such as for example when igneous dikes and sills are emplaced in
... Inclusions solid pieces of rock in another rock "Inclusions are always older than the rock they are in"
the age of a rock given as the number of years since the rock formed
how is absolute age determined?
it can be determined by using properties of the atoms that make up materials (fossils, radio metric dating,etc.)
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.
Fossil for which the relative age of a rock is known. Scientists use these fossils to find out the order of rock layers
measurement of the amount of radioactive material (usually carbon 14) that an object contains based on the amount of remaining radioactive isotopes it contains.
Uniformitarianism (principal of geology)
A principle that states that the same geologic processes shaping the Earth today have been at work throughout the Earth's history.
why is yellowstone biological island
because of the osolatiom it has different vegetation
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