Minerals that grow as crystals in cooling lava can become magnetized if they contain iron.
Igneous rocks are composed of minerals that crystallise at a variety of different temperatures. This explains how a cooling magma could contain some crystals while still being primarily liquid. The Bowen reaction series is the pattern of mineral crystallisation from a magma.
Individual plagioclase crystals can be zoned from more sodium-rich around the exterior to calcium-rich in the centre when cooling occurs reasonably quickly. Because it controls how long the reaction can last before all the silica is consumed, the initial magma's composition is crucial to the crystallisation of magma.
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D. A column is a result of a stalactite and a stalagmite growing together.
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