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.
Chainsaws need sharpening from time to time, especially if you are cutting up dirty logs or near the ground. The worst is if the teeth are dull towards just one side. This causes the chain to deflect sideways, which results in a cut that tries to follow a curve. That in turn can cause the bar to get stuck in the kerf. The conventional way to sharpen the chainsaw is with a chainsaw file.