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.
Laurie Halse Andersonâs Chains, published by Simon & Schuster in 2008, is a young adult novel. The main character is Isabel, a thirteen-year-old slave who works for the Locktons, a Loyalist family in Manhattan with her sister, Ruth.