1.a body of rock that is intruded by another rock must be in age than the intrusion.
2.fragments of a rock that are contained in a layer of another rock must be in age than the layer of rock that surrounds them.
3.
the principle of original horizontality states that rocks were deposited in horizontal layers. thus, if rock layers are now they must have been disturbed after lithification
4.the principle of states that rock layers extended laterally in all directions unless or until they terminate in one of a number of natural means.
5. the two major types of seismic waves are waves and waves.
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