Since we don't know what "your area" might be, we can't really answer this for you. You'll need to do some research and see what different cultures live where you do.
The most common rock forming mineral groups would be: silicates, carbonates, sulfates, sulfides, halides, and oxides.
No, circumcision is not a common practice in Iraq among the general population. It is mainly practiced within specific religious and cultural communities, such as the Kurdish and certain Muslim groups.
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Among several ethnic/cultural groups, the Aztecs and Mayans were the most important.
Most ethnic groups share a common culture which is their main connection point. Each of the native ethnic groups had their unique culture which they shared and some cut across the board to other ethnic groups.
Hinduism and Sheikism and Buddhism are 3 of them. Hinduism is most common.
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Lay eggs.The most common reproductive strategy in all groups of reptiles is that of laying eggs.Edit: The 'reproductive strategy common in all groups of reptiles' is - internal fertilization through copulation. This distinguishes them from amphibians who lay soft-bodied eggs in water, which are then fertilized by the male ejecting a 'cloud of sperm'.
The most common rock forming mineral groups would be: silicates, carbonates, sulfates, sulfides, halides, and oxides.
Snakes are most common in mesoamerican cultural art, though they are a staple of almost all ancient cultural arts.
Chechen has the most speakers, but no one language in the Caucasus can be considered common in the area.