Polka Denmark (galopp, hopsa), Estonia (polka), Finland (pariisipolkka, polkka), Iceland, Norway (galopp, hamborgar, hopsa/hopsar, parisarpolka, polka, polkett, skotsk) and Sweden (polka). The beats are not as heavy as those from Central Europe and the dance steps and holds also have variations not found further south. The polka is considered a part of the gammeldans tradition of music and dance. While it is nowhere near as old as the older Nordic dance and music traditions, there are still hundreds of polka tunes in each of the Nordic countries. They are played by solo instrumentalists or by bands/ensembles, most frequently with lead instruments
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