Englishfor English speakers
carbon
Noun
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The chemical element (symbol C) with an atomic number of 6.
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A piece of carbon paper.
Make sure the carbon is facing the second sheet of paper, before rolling it into the typewriter.
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A carbon copy.
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A fossil fuel that is made of impure carbon, such as coal or charcoal.
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, when talking about global warming and climate change.
oxygen
Noun
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Oxygen is a chemical element (symbol O) with an atomic number of 8.
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Oxygen is a type of gas.
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An oxygen is an atom of the element oxygen.
nucleus
Noun
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A nucleus is the center of a cell or atom.
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The center of anything.