The general concepts found in this section are: 1  The earth's atmosphere is a very thin layer wrapped around a very large planet. 2  Two gases make up the bulk of the earth's atmosphere: nitrogen (), which comprises 78% of the atmosphere, and oxygen (), which accounts for 21%.
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Definition - What does Lean Software Development mean? Lean software development is a software development philosophy that aims to streamline the production of applications and software products, and to make them more efficient. The philosophy is popularly attributed to the book of the same title by Mary and Tom Peppendieck.