Igneous Rock - Week 2

For my field trip this week, I went to a very cool place in my hometown of Milwaukee called the Urban Ecology Center. There, I learned that the most common igneous rocks in my state are granite, diorite, syenite, and gabbro (intrusive), and also  basalt, felsite, and rhyolite (extrusive). I'd heard of many of these, but not all of them, before speaking with the experts at the Center. They took me down to the Milwaukee River were I saw some basalt bedrock firsthand. On the northern border of Wisconsin and Minnesota, there is a large amount of basalt to be found. Although granite is the most common of all igneous rocks in Wisconsin, basalt is also very present. These igneous bedrocks are often covered by hundreds or thousands of feet of sedimentary rocks.