Square dance club goal is to promote and advance square dance as a recreational activity. Typically clubs accomplish this goal through the following activities: This is not an exclusive list, and square dance clubs are constantly on the look out for new ways to achieve their goals. Associations, partnerships and other cooperative ventures have become increasingly more important to square dance clubs. Membership in square dance clubs seems to have peaked in the late '70s and early '80s, and has gradually decreased since that time. Providing classes and training opportunities is the main activity for the majority of square dance clubs. This activity
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