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The hot molten material occurring naturally below the surface of the Earth is called:

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in Basic Civil Engineering by (111k points)
The hot molten material occurring naturally below the surface of the Earth is called:

(a) Lava

(b) Slag

(c) Magma

(d) Tuff

I had been asked this question in class test.

This is a very interesting question from Source and Classification of Stones topic in chapter Materials for Construction of Basic Civil Engineering

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Right answer is (c) Magma

For explanation: Hot molten material is called Lava when it erupts from a volcano and reaches the surface. Slag is waste material from the smelting of ore. Tuff is a porous rock formed by a consolidation of volcanic ash.

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