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soil science
He is majoring in soil science at university.
air pollution
Air pollution is having a serious impact on the health of the planet.
dull, spiritless / inactive / stagnant
His class is dull, and the students are bored.
dullness, spiritlessness / inactivity / stagnation
(phonetics) ejective
His language contains many ejective sounds.
(meteorology) an atmosphere (gases surrounding an astronomical body)
He is dedicated to the study of the atmosphere.
nitriding, nitridation
Nitriding is often used to increase the surface hardness of metals.
nitridate
High temperature and high pressure are required to nitridate this metal.
nitrogen cycle
The nitrogen cycle is very important for maintaining ecosystems on Earth.
liquid nitrogen
Liquid nitrogen is very cold, so care must be taken when handling it.
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