repetitive - definition and synonyms. What are red words? 90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.
Quark is a traditional, creamy, vegetarian, unripened cheese tracing its origin to German-speaking and eastern European countries. It is known by many names, chief among them being ÑÐ²Ð¾ÑÐ¾Ð³ in Russian, tvaroh in Czech and Slovak, topfen in Austria, kwark in Dutch, kvark in Denmark and kvarg in Norway and Sweden.
Quarks are one type of matter particle. Most of the matter we see around us is made from protons and neutrons, which are composed of quarks. There are six quarks, but physicists usually talk about them in terms of three pairs: up/down, charm/strange, and top/bottom. (Also, for each of these quarks, there is a corresponding antiquark.) Be glad that quarks have such silly names -- it makes them easier to remember! Quarks have the unusual characteristic of having a fractional electric charge, unlike the proton and electron, which have integer charges of +1 and -1 respectively.