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the age of a rock compared to the ages of other rocks
relative age
the age of a rock given as the number of years since the rock formed
absolute age
the geoligic principle that states that in horizontal layers of sedimentary rock, eacher layer is older than the layer above it and younger thatn the layer below it
law of superposition
an igneous rock layer formed when lava flows onto Earth's surface and hardens
extrusion
an igneous rock layer formed when magma hardens beneath Earth's surface
intrusion
a break in a Earth's crust along which rocks move
fault
fossils of widely distrubuted organisms that lived during a geologically short period
index fossil
a gap in the geologic record thta shows where rock layers have been lost due to erosion