An isogloss in a linguistic atlas represents a boundary line that separates regions where different linguistic features are present. It is used to show dialectal variations within a language or language family.
isogloss
An example of an isogloss is the pronunciation of the word "water" in the United States: some people say "waw-ter" while others say "wah-ter", creating a linguistic boundary.
Geography.
no executive branch
No executive branch
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Blues artists were traveling musicians, making it difficult to establish a permanent address
Teens who establish strong relationships with positive role models seldom abuse drugs or alcohol. It's difficult to establish a relationship with someone over the Internet. Once you establish new friendships, you won't miss your old school so much.
Maybe, their could be Tsunami's, earthquakes and maybe volcano explosions.
Blues artists were traveling musicians, making it difficult to establish a permanent address.
all of the above