Polka in the United States music and dance and to honor their heritage at polka festivals. Modern media enables these fans to stay connected and share their passion. Though it passed its heyday in the 1950s the polka remains an active music form with distinct genres, leading performers, and active organizations. Where it is popular, the polka is a manifestation of the culture of those who participate in it. It is the state dance of Wisconsin. Although author Charles Keil admits that "there are as many styles of polka as there are polka localities", he and his wife have divided American polka music into three
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