Siljan Ring Siljan Ring The Siljan Ring () is a prehistoric impact crater in Dalarna, central Sweden. It is one of the 15 largest known impact craters on Earth and the largest in Europe, with a diameter of about . The impact that created the Siljan Ring occurred when a meteorite collided with the Earth's surface during the Devonian period, about 376.8 ± 1.7 Ma. This coincides around the first Devonian extinction, the Kellwasser Event or Late Frasnian extinction at 376.1 Ma ± 1.6 Ma. The effects of the impact can clearly be seen in the bedrock in the area. The Cambrian,
Mora (linguistics) Mora (linguistics) A mora (plural "morae" or "moras"; often symbolized μ) is a unit in phonology that determines syllable weight, which in some languages determines stress or timing. The definition of a mora varies. In 1968, American linguist James D. McCawley defined it as "something of which a long syllable consists of two and a short syllable consists of one". The term comes from the Latin word for "linger, delay", which was also used to translate the Greek word "chronos" (time) in its metrical sense. Monomoraic syllables have one mora, bimoraic syllables have two, and trimoraic syllables have three, although