Rachel
East High
https://www.angelfire.com/blog/diffgeoscience/
icanxxpretend@hotmail.com
GEOLOGIC PRINCPLES & RELATIVE AGE:
* Principle of Uniformitariamism - what's happening natuarlly now happened in the past.
ex. - volcanoes, rivers, erosion, etc.
* Index fossils - fossils found only at certain times in the geologic record
* Principle of Superpositon - states that in an undisturbed rock sequence, the oldest rock layers are at the bottom and each successive layer is younger than the layer beneath.
* Crosscutting relationships - tectonic activity disturbs strata and the fault is always younger than the rocks themselves
* The rock layers are called strata
* Relative age - comparing rock layers, determining the bottom layers are older than the top
* Stratified - sedimentary rock
* Unstratisfied - metamorphic or igneous rock
ABSOLUTE AGE:
