vocab
reletive age of a rock compared to the ages of other rocks
reletive age
which layer is the top
relitive age is the top layer
A record of the geologic events and life forms in Earth's history.
geological time scale
a vertebrate whose temp is determined by the temp of its enviiroment
reptile
Feburary 9 1895
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the age of a rock given as the number of years since the rock formed
absolute age law of superposition
which layer is the bottom
absolute age law of superposition is the bottom layer
One of the three long units of gelogic time between the Precambrain and the present
era
When to many types of living things become extinct.
mass extinction
December 21 1891
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the gap in the geologic record that shows where rock layers have been lost due to erosion
unconformity
which is the newest layer
the relitive age is the newest layer
One part of the units of geologic time into which geologists divide eras
period
a vertebrate whose body temperature is determaided by the temperature of its enviroment
amphibain
December 19 1863
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The process in wgich the nuclei of radioactive elements break down, releasing fastmoving particles and energy
radioactive decay
Which is the oldest layer
Absolute age of law superposition is the oldest layer
What is the geological timescale
What is a chronological calendar of Earth's history
an animal with a backbone.
vertebrate
Thanksgiving Day 1887
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the process of determining the age of an object usinng the half-life of one or more radioactive isotopes
radioactive dating
How could a geologists match the rock layer in one area to rock layers found in another area?
comparing the sequence of rock types.
what method do geologists use to find the absolute ages of rocks?
radiometric dating
an animal without a backbone.
invertebrate
776 BCE in Greece
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