here are some sites for ancient Greece they are not all about beliefs but they still might help you
http://www.schoolsliaison.org
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http://www.canadianlawsite.ca
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http://www.historyforkids.org
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http://www.workablepeace.org/
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http://en.wikipedia.org/wiki/Relh
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http://www.greeka.com/Greece-traditions.htm
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http://library.thinkquest.org/CR0210200/ancient_greece/Greece.htm
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They were similar because they both shared some beliefs such as myths and gods and goddesses
Some artifacts arefrom ancient Greece because they were produced there
what are some popular monuments in ancient greece
Nothing, Ancient Greece came before Ancient Rome, and actually Ancient Rome took things from Greece, Romans were influenced by Greek religion and some of their architecture.
Some of the main harbors in ancient Egypt and Greece included the harbor of Alexandria, and Naucratis.
The people from ancient Greece were known for their height, or lack of. They were a particularly short people.
Some of the words you use and some of the stories you hear come from Ancient Greece.
Some artifacts arefrom ancient greece because they were produced there
I assume you mean "Zeus". That's one of the Olympians, one of the gods of Ancient Greece (though there are still some people who believe in the Olympians). Ancient Greeks believed in several gods; Zeus was the ruler over these gods - according to the ancient beliefs.
Some important exports from ancient Greece are olive oil, wine metalware, and beautiful pottery.
The ancient Greeks lived in Greece. The normal house was a courtyard with rooms around it. Most Greeks lived near the Eastern Mediterranean Sea and in southern Europe. Some citys they lived in are Athens, Sparta, and Crete. They inspired many cultures from their beliefs.
One of their beliefs is that they have one supreme god.