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At what depth and rate is a hypabyssal rock formed?(a) Slow cooling of magma at considerable depth(b) Quick cooling of magma at a shallow depth(c) Rapid cooling of magma at Earth’s surface(d) Rapid cooling of magma at a shallow depthI had been asked this question in an interview.This is a very interesting question from Source and Classification of Stones in section Materials for Construction of Basic Civil Engineering

Answer» RIGHT choice is (B) Quick cooling of MAGMA at a shallow depth

Easy explanation: Plutonic rocks are FORMED by slow cooling of magma at considerable depth. Volcanic rocks are formed near the surface of Earth by rapid cooling of magma. Hypabyssal rocks are formed at a quick rate of cooling of magma at considerably shallow DEPTHS.


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