What is the diference between intrudive rocks and extrusive rocks

An Extrusive volcanic rock cools quick at first and is made by magma. Subsequent to the cooling procedure is quick extrusive molten rocks have little gems (fine grained). Then again an Intrusive cools gradually underneath the surface and is made by magma.

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Chromosome banding refers to alternating light and dark regions along the length of a chromosome, produced after staining with a dye

Explanation: