What is a "hiato"?
I know that two weak vowels or a weak and a strong vowel form a dipthong. What do two strong vowels form? Is this a "hiato"? What do a strong vowel and a weak vowel with an accent mark on top of the weak vowel form? Is this called a "quiebradiptongo"? Is a "quiebradiptongo" a "hiato" also? Thank you for your attention.
Two strong vowels form two syllables (or the vowels for two syllables). I don't know if that's called a hiatus (hiato). When a weak vowel carries a tilde (accent) it becomes a strong vowel, so a strong vowel and an accented weak vowel become the vowels for two separate syllables. I can't answer the rest of your question with any assurance of being correct, but the "quiebradiptongo" looks like "broken dipthong" which makes sense in this context.
Diptongo - a weak vowel and a strong vowel together in the same sylllable
Hiato - in one word when two vowels are together (Two strong, one weak with a tilde and a string, or two weak both having a tilde) in separate syllables
This whole discussion is over my head. Trying to learn Spanish has revealed to me that even though I speak and write English at a professional level, I don't know enough about grammar.
I found in my text book that they are vowels that are next to each other that are in separate syllables.
[mi-o] [te-a-tro] [ka-er]