Polonaise instrumentation. Polonaise The polonaise (, ; ) is a dance of Polish origin, in time. Its name is French for "Polish." The polonaise has a rhythm quite close to that of the Swedish semiquaver or sixteenth-note polska, and the two dances have a common origin. The polonaise is a widespread dance in carnival parties. The polonaise is always a first dance at a "studniówka" ("hundred-days"), the Polish equivalent of the senior prom that occurs approximately 100 days before exams. The notation "alla polacca" ( means "polonaise") on a musical score indicates that the piece should be played with the 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