Discussion
Igneous rocks are formed by the
Answer: A
Correct answer: solidification of molten material
Igneous means born of fire: the rock forms when magma or lava cools and crystallises. That single origin explains its interlocking crystal texture, its lack of bedding, and the fact that grain size records the cooling rate. Cementing of grains gives sedimentary rock, recrystallisation gives metamorphic, and precipitation from solution gives the chemical sediments.
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