Wikipedia contributors. (2023, August 28). Intrusive rock. In Wikipedia, The Free Encyclopedia. Retrieved October 29, 2023, from https://en.wikipedia.org/w/index.php?title=Intrusive_rock&oldid=1172656316
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/geology/rocks/intrusive-rock/characteristics/snippet-characteristics-1-1.md
A second bridge, across the North Fork of the Skagit River, leads to La Conner, 3.7 miles (6.0 km) northwest.
Intrusive rock (Wikipedia) Intrusive rock is formed when magma penetrates existing rock, crystallizes, and solidifies underground to form intrusions, such as batholiths, dikes, sills, laccoliths, and volcanic necks.