The yarn number is the length in yards of one pound of the yarn, divided by 1600. Symbol Nar. This is the same as the weight in ounces of 100 yards. So one pound of number 1 run yarn is 1600 yards long, one pound of number 2 run yarn is 3200 yards long, and so on.
As with most other volcanoes in the Cascade Range, Mount St. Helens is a large eruptive cone consisting of lava rock interlayered with ash, pumice, and other deposits. The mountain includes layers of basalt and andesite through which several domes of dacite lava have erupted.
Mount St Helens is located in the Cascade mountain range in the state of Washington in the United States and is famous for its devastating 1980 eruption, which killed 57 people.Among the dead were a geologist and others who were monitoring the volcano.he eruption of Mount St Helens and another volcano in Mexico called El Chichon two years later were the first times that pyroclastic flows â clouds of very hot gas, ash and rock that move at hundreds of miles per hour â were studied using modern scientific techniques.