The increased popularity and availability of televisions has led to the decline of regional dialects, language
variationswhich originate from diverse ethnic and cultural heritages and perpetuated by geographic isolation.
'Language variations...' is an absolute phrase. 'which...' and 'perpetuated..' tell us more about language variation. To check whether 'perpetuated' is a ver-ed modifier or verb? We should ask the question, Did 'language variations' do the action of perpetuation? No. 'Perpetuating was done
...
variationswhich originate from diverse ethnic and cultural heritages and perpetuated by geographic isolation.
'Language variations...' is an absolute phrase. 'which...' and 'perpetuated..' tell us more about language variation. To check whether 'perpetuated' is a ver-ed modifier or verb? We should ask the question, Did 'language variations' do the action of perpetuation? No. 'Perpetuating was done
...