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.
Chain is defined as to fasten, secure or confine. An example of to chain is to handcuff someone. 1  a flexible series of joined links, usually of metal, used to pull, confine, etc. or to transmit power. 2  tire chain.  bonds, shackles, etc.