What caused this dime and nickel to look like this?

And woodies are a result (generally) of an alloy mixture in the metal.

Usually a bad mix

 

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If the field, around a word or date, are the streaks consistent without it being on the word or date itself ? I cant tell by the pics.

 

Wasn't sure if this question was directed toward me or coingeek but my coins have the streaks through the words and date.

 

Yes, you are correct!

Now I need to train my brain to get it right the next time!