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.
The Top Ten Reviews Silver Award goes to the Craftsman 18 Inch. This is the saw to go for if you need to power through your yardwork. Its 46cc two-cycle engine adds to the weight of this 15-pound chainsaw, but delivers the power you expect from such a large gas engine.