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If You Hold Three Fingers Up in Front of You

question 38

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If you hold three fingers up in front of you at arm's length,you will not only see three extended digits,but you will also "see" two "Vs" in the negative space between your fingers.According to theories of perception,what explains why we perceive lines when they are really not present?


Definitions:

Tectonic Terrane

A fault-bounded body of rock that has a different geologic history than adjacent regions.

Horst and Graben

Geological structures where a horst is a raised block of the earth's crust bordered by faults, and a graben is a lowered block of the earth's crust bordered by parallel faults.

Forearc Basin

A sedimentary basin that lies between the volcanic arc and the trench in a convergent plate boundary.

Sedimentary Unit

A layer of sedimentary rock with distinguishable characteristics that set it apart as a visually identifiable segment of a stratigraphic sequence.

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