- Gettysburg, Pennsylvania (Wikipedia)
Gettysburg (/ˈɡɛtizbɜːrɡ/; locally /ˈɡɛtɪsbɜːrɡ/) is a borough in Pennsylvania and the county seat of Adams County, Pennsylvania, the United States. As of the 2020 census, the borough had a population of 7,106 people.
- Extrusive rock (Wikipedia)
Extrusive rock refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff. In contrast, intrusive rock refers to rocks formed by magma which cools below the surface.