Viking Age arms and armour to claim it for Odin. Possibly due to its cultural significance, pattern welded blades are common in spear heads, and the sockets were often decorated with silver inlaid patterns. A polearm known as the "atgeir" is mentioned in several sagas of Icelanders and other literature. "Atgeir" is usually translated as "halberd", akin to a glaive. Gunnar Hámundarson is described in "Njáls saga" as cutting and impaling foes on his "atgeir". Several weapons (including the "kesja" and the "höggspjót") appearing in the sagas are Viking halberds. No weapon matching their descriptions have been found in graves. These weapons may have been
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