Jesusengland He is an expert on Swedish geology Correct. The adjective (Swedish) has no influence on the article, or rather, lack of it: Swedish geology Romanian music Norwegian literature mediaeval art Jesusengland He is an expert on the subject Correct. A specific subject is meant, so the article is needed.
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JesusenglandHe is an expert on Swedish geologyCorrect. The adjective (Swedish) has no influence on the article, or rather, lack of it:
JesusenglandHere, we are talking about a specific geology, Swedish.I can offer no further help. I have already said that the adjective doesn't bring on the article. This is usually true about cultural things and various kinds of art. Logic doesn't always apply in English. The article is used with
I would be grateful for your help.