Explanation:
Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust. All magma develops underground, in the lower crust or upper mantle, because of the intense heat there.
<h2>hope it helps u </h2>
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Population Density.
Brainliest would be appreciated.
It increases the average household income by 36%
The answer for this qn is D.
