Polka dot Polka dot Polka dot is a pattern consisting of an array of large filled circles of the same size. Polka dots are most commonly seen on children's clothing, toys, and furniture, but they appear in a wide array of contexts. The pattern rarely appears in formal contexts, however, and is generally confined to more playful attire such as bathing suits and lingerie. Occasionally, white-on-black small dots appear on more formal clothing. It is likely that the term originated in popularity of polka dance at the time the pattern became fashionable, just as many other products and fashions of the era
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