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Relative Dating

You will understand how rocks and fossils form and order of events over time.

QuestionAnswer
Relative Dating A method of putting events in the order in which they happened.
Fossil A part of dead animal or plant that has been preserved for a long time.
Superposition The bottom layer of a rock formation is older than the layer on top, because the bottom layer is formed first.
Original Horizontality Sediment particles fall to the bottom of a body of water and create horizontal layers of rock. Sometimes the movements of the Earth can slowly move these horizontal layers into vertical layers.
Lateral Continuity When layers of sediment are formed they extend in all directions horizontally. Separation may be caused by erosion or an earthquake and we see that layers on one side of a gap match up with layers on the other side.
Cross-cutting Relationships A vein of rock that cuts across a rock's layers is younger than the layers.
Inclusions Sometimes rock pieces are found inside another rock. These pieces are called inclusions and are older than the surrounding rock.
Faunal Succession Fossils can be used to identify the relative age of layers of a rock formation.
Uncomformaties In some rock formations, layers or parts of layers may be missing. This is often due to erosion.
Created by: mrs b
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