Glossary of Selected Geologic Terms

a'a—a lava rock with a ropey, frothy surface texture formed as a cooling crust on a fluid lava flow.ablation—the removal of snow and ice by melting or evaporation, typically from a glacier or ice field.abrasion—the process of wearing down or rubbing away by means of friction, typically by wind-blown dust or sand.absolute dating—general term applied to a range of techniques that provide estimates of the age of objects, materials, or sites in real calendar years either directly or through a process of calibration with material of known age.

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