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.
How to Change a Chainsaw Chain. While all chainsaw brands are slightly different in appearance, most of them adhere to a basic design. For instance, chainsaws are invariably manufactured with the chain and blade on the right side of the tool, which can be an inconvenience for left-handed users.