TROPOSPHERE, The area where we live, STRATOSPHERE, The most stable layer of the atmosphere, MESOSPHERE, The 3rd layer of the atmosphere, THERMOSPHERE, The 4th layer of the atmosphere, IONOSPHERE, it is a part of thermosphere that is full of electrically charged atoms, EXOSPHERE, The uppermost layer of the atmosphere, DECIBEL, Unit used to measure sound intensity, TIMBRE, The tone color or tone quality of sound, ECHO, The reflected sound, NOISE, the unwanted sound

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