Mobile, Alabama. Mobile, Alabama, on the Gulf of Mexico, is home to Evonik's largest North American site. The 700 or so employees here produce hydrogen peroxide, fumed silica, and the animal feed additive methionine, among other chemicals.
A complex volcano, also called a compound volcano, is a volcano with more than one feature. They form because of changes in their eruptive characteristics or the location of multiple vents in an area.
Rhyolite caldera complexes are the most explosive of Earth's volcanoes but often don't even look like volcanoes. They are usually so explosive when they erupt that they end up collapsing in on themselves rather than building any tall structure (George Walker has termed such structures inverse volcanoes).