1. Development of inverted relief through which anticlines are transformed into valleys and synclines are changed into mountains. 2. The occupancy by a lava flow of a ravine or valley that occurred in the side of a volcano. 3. A diagenetic process in which unstable minerals are converted to a more stable form without a change in chemical composition. 4. A departure from the usual decrease or increase with altitude of the value of an atmospheric property, most commonly temperature.
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