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.
A pendulum is a length of chain or string with a weight on one end and just about any weight on a string or chain will work: a pendant, a wet teabag, a bead on a thread... you get the idea!. If you prefer, you can buy one online or in shops in your community.