Field with gabbro boulders

Field with gabbro boulders

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Field with gabbro boulders. Also called crusairs, these boulders once formed the landscape of parts of ancient Cornwall in the UK. These are the remains of eroded outcrops, equivalent to granite tors. Gabbro, a coarse-grained igneous rock, is formed by the slow and gradual crystallization of basaltic magma at large depth under the Earth's surface.

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Keywords: boulders, britain, british, coarse grained, core stones, cornwall, countryside, crusair, crusairs, earth science, england, english, eroded, erosion, europe, european, field, gabbro, geological, geology, geomorphology, glacial, horizon, igneous, landscape, mafic igneous rock, main dale, outcrop, outcrops, physical geography, rock, rocks, rocky, uk, united kingdom, volcanic

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