define the four principles of relative dating

Sand particles sandstone can be deposited in one area, while clay particles shale can be deposited in another at the same time. Patterson analyzed meteorite samples for uranium and lead using a mass spectrometer. How close were your guesses? Rock layers are formed first in flat layers. The 14 C quickly bonds with oxygen O in the atmosphere to form carbon dioxide 14 CO 2 that mixes with other atmospheric carbon dioxide 12 CO 2 and this mix of gases is incorporated into living matter. You can color the units to help you. Recall the law of cross-cutting relationships to figure out "what cuts what".

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