The transition zone, in the context of Earth's geology, refers to a specific layer within the Earth's mantle, situated between the upper mantle and the lower mantle. This zone lies approximately between 410 and 660 kilometers (about 255 to 410 miles) below the Earth's surface. ### Characteristics of the Transition Zone: 1. **Composition and Mineralogy**: - The transition zone is characterized by significant changes in mineral compositions.

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