Science - Ch 7 Section 2

the age of a rock compared to the ages of other rocks

the age of a rock given as the number of years since the rock formed

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

an igneous rock layer formed when lava flows onto Earth's surface and hardens

an igneous rock layer formed when magma hardens beneath Earth's surface

a break in a Earth's crust along which rocks move

fossils of widely distrubuted organisms that lived during a geologically short period

a gap in the geologic record thta shows where rock layers have been lost due to erosion