An intrusion is any body of intrusive igneous rock, formed from magma that cools and solidifies within the crust of the planet.
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Niels Bohr (Wikipedia)Niels Henrik David Bohr (Danish: [ˈne̝ls ˈpoɐ̯ˀ]; 7 October 1885 – 18 November 1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research.