Pole weapon long blade used by both infantry and cavalry. Occasionally glaive blades were created with a small hook or spike on the reverse side. Such glaives are named glaive-guisarme. A voulge (occasionally called a pole cleaver) is a curved blade attached to a pole by binding the lower 2/3 of the blade to the side of the pole, to form a sort of axe. Looks very similar to a glaive. A svärdstav (literally sword-staff) is a Swedish medieval pole arm that consists of a two-edged sword blade attached to a staff. The illustrations often show the weapon being equipped with sword-like
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