Relative age of rocks https://www.youtube.com/watch?v=YgE-dSx-fPc&index=10&list=FLiMHnzsv_NuqhZrtgX5Rfxg

Think pair share

Law of Superposition Top = youngest layer In undisturbed sedimentary rock or lava flows In undisturbed sedimentary rock or lava Top = youngest layer Bottom = oldest layer The Law of Superposition is that an undeformed sedimentary rock layer is older than the layers above it and younger than the layers below it.

Law of Cross-Cutting Relationships Any feature that cuts across a rock or layer of sediment is younger than the rock or layer it cuts youngest layer

Example of Cross-Cutting Intrusion - igneous rock that forms when magma squeezes between existing rock and hardens Intrusion - igneous rock that forms when magma squeezes between existing rock and hardens

Example of Cross-cutting Examples of Cross-Cutting Extrusion - igneous rock that forms when lava flows on Earth’s surface and hardens

Example of Cross-cutting Example of Cross-cutting Inclusion - pieces of older rock trapped within younger rock

Examples of Cross-Cutting Faults, joints, tilts, and veins also follow the law of cross--cutting relationships

Formation of an Unconformity

Formation of an Unconformity

Formation of an Unconformity

Formation of an Unconformity

Formation of an Unconformity

Picture of Unconformity