International Polka Association the mutual interests and encourage greater cooperation among its members who are engaged in polka entertainment; and to encourage and pursue the study of polka music, dancing and traditional folklore." The IPA is structured to serve as an educational resource. The IPA is also responsible for the continued operation and growth of the Polka Music Hall of Fame and Museum. It is through this branch that the association has been able to continue its historical, educational and research goals on behalf of polka music. International Polka Association The International Polka Association (IPA) is located in Chicago, Illinois and dedicated to
Types of volcanic eruptions Types of volcanic eruptions Several types of volcanic eruptions—during which lava, tephra (ash, lapilli, volcanic bombs and volcanic blocks), and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed. Some volcanoes may exhibit only one characteristic type of eruption during a period of activity, while others may display an entire sequence of types all in one eruptive series. There are three different types of eruptions. The most well-observed are magmatic eruptions, which involve the decompression of gas within magma that