
1) Formation 2) Geological formation 3) Geological process
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https://www.crosswordclues.com/clue/diapir

A diapir (ɪər; French, from Greek diapeirein, to pierce through) is a type of intrusion in which a more mobile and ductily deformable material is forced into brittle overlying rocks. Depending on the tectonic environment, diapirs can range from idealized mushroom-shaped Rayleigh–Taylor-instability-type structures in regions with low tectonic s...
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http://en.wikipedia.org/wiki/Diapir

a type of intrusion in which a more mobile and ductily-deformable material is forced into brittle overlying rocks.
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http://en.wikipedia.org/wiki/Glossary_of_geology

(from Greek diapeirein, `to pierce`), geological structure consisting of mobile material that was forced into more brittle surrounding rocks, usually ... [1 related articles]
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http://www.britannica.com/eb/a-z/d/43

a tear-drop, spherical or elliptical structure created when ductile rock flows towards the surface due to its low density;
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http://www.encyclo.co.uk/visitor-contributions.php
noun a domed rock formation where a core of rock has moved upward and pierced through the more brittle overlying strata
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https://www.encyclo.co.uk/local/20974

a dome, or anticline, the upper regions of which have been ruptured and penetrated by material squeezed up from below. Cf. plume (def. 10),
Found on
https://www.infoplease.com/dictionary/diapir
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