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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incubator noun [C] uk / ËÉªÅkjÊbeÉªtÉ r / us âº an organization that helps people to start new companies, especially ones involved with advanced technology: The university has a business incubator to foster technology start-ups. an incubator unit (Definition of âincubatorâ from the Cambridge Business English Dictionary Â© Cambridge University Press)