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.
About Mount St. Helens. Mount St. Helens is part of the ring of fire encircling the Pacific Ocean. It was created and is continually being changed by the collision of the North American and the Juan de Fuca Tectonic Plates.Mount St. Helens is the youngest and most active Cascade Range volcano, born 40,000 years ago.It erupts roughly once each century.t was created and is continually being changed by the collision of the North American and the Juan de Fuca Tectonic Plates. Mount St. Helens is the youngest and most active Cascade Range volcano, born 40,000 years ago. It erupts roughly once each century.