The Eastern (as opposed to the oriental) Orthodox Church in general (not just the Greek Orthodox jurisdiction) differs from the Catholic Church in:
Catholics believe the Pope is superior in authority in religious and administrative matters above all other bishops as well as having the ability to invoke papal infallibility when expressing dealing with dogmas affecting the belief of the universal Church with regards to Faith and Morals. (Jesus Christ granted Saint Peter, the first pope, this role when he said "thou art Peter; and upon this rock I will build my church, and the gates of hell shall not prevail against it. And I will give to thee the keys of the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose upon earth, it shall be loosed also in heaven." - Matthew 16:18-19.) It is also held in Tradition that he is the infallable head. There are also many other Bible references, however that is the main one.
The Orthodox don't accept Christ's message to Peter as for him being the infallable head, they don't think he had any special difference.
The Catholic Church has the doctrine of the Virgin Mary's "Immaculate Conception", the Orthodox Church does not.
The Catholic Church believes in Purgatory, where the Orthodox does not believe in it.
There are tons of other minor differences, the ones above are just the major differences that I can think of.
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difference between primary auxiliary verbs and modal verbs
Identify the difference between primary sector and secondary sector
Russian Orthodox chruch is part of the Orhtodox Cannon, the oldest form of Christianity. The Church is part of the same group that includes the Greek, Armenian and other ORthodox Churchs. The only difference between the Russian and other Orthodox churches is their primary language, and other non-christian traditions like dances, prominant festivals, or supersticions. But as far as the rest of Christianity goes, the Orthodox's main difference is a unique date for Easter, their ties with the old testament, and their more strict christian lifestyle adhering to more fast days then any other sect of Christianity.
what are the diffrence between primary reserve and secondary reserve?
The difference between primary data and secondary data is that primary data is the information from the original research.
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Primary can't be recharged, secondary can be recharged.
Speed.