The stratosphere (/ËstrÃ¦tÉËsfÉªÉr, -toÊ-/) is the second major layer of Earth's atmosphere, just above the troposphere, and below the mesosphere. About 20% of the atmosphere's mass is contained in the stratosphere.
The chainsaw is a highly effective and efficient tree and branch cutting power tool. It works with an engine, referred to as a power head; powering a metal chain, driven by a centrifugal clutch, with a chain moving around a groove in the guide bar at fast speeds.
Hitachi Chainsaws. A neighbor of mine just bought a 40cc example for $250 from Sears. It is made in China and looks like to be all plastic. He bought it though because it has a 7 year consumer warranty, 2 year professional warranty and a 1 year rental warranty.