A scientist who studies the formation, composition, and structure of crusts, especially Earth's crust or the crusts of other planets.
From crust (Latin crusta) plus -logy (Greek logos 'study') plus -ist (one who practices). It describes a specialist in understanding crusty layers and formations.
Crustalogists studying Mars and Venus have discovered that these planets have very different crustal structures from Earth—Venus has a young, uniform crust suggesting it was completely resurfaced by volcanism just 300-600 million years ago.
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