Polonaise character of a polonaise. For example, the third movement of Beethoven's Triple Concerto op. 56, marked "Rondo alla polacca," and the finale of Chopin's Variations on "Là ci darem la mano" both feature this notation. In his book "Classic Music: Expression, Form, and Style", Leonard G. Ratner cites the fourth movement from Beethoven's Serenade in D major, Op. 8, marked "Allegretto alla Polacca," as a representative example of the polonaise dance topic (Ratner 1980, pp. 12–13). Frédéric Chopin's polonaises are generally the best known of all polonaises in classical music. Other composers who wrote polonaises or pieces in polonaise rhythm
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