Vowel whose quality does not change over the duration of the vowel is called a monophthong. Monophthongs are sometimes called "pure" or "stable" vowels. A vowel sound that glides from one quality to another is called a diphthong, and a vowel sound that glides successively through three qualities is a triphthong. All languages have monophthongs and many languages have diphthongs, but triphthongs or vowel sounds with even more target qualities are relatively rare cross-linguistically. English has all three types: the vowel sound in "hit" is a monophthong , the vowel sound in "boy" is in most dialects a diphthong , and
Types of chocolate way as chocolate / quasi chocolate. Chocolate is a product based on cocoa solid or cocoa fat or both. The amount and types of cocoa solids and fat that the term implies is a matter of controversy. Manufacturers have an incentive to use the term for variations that are cheaper to produce, containing less cocoa and more cocoa substitutes. There has been disagreement in the EU about the definition of chocolate; this dispute covers several ingredients, including the types of fat used and the quantity of cocoa. In 1999, however, the EU resolved the fat issue by allowing up to