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A group of people who live together and have social, political, economic and religious structure
Shifts in the Earth's crust cause tectonic plates to shift along the fault lines. This causes extreme friction & energy which is released in waves, causing an earthquake.
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U.S. culture has also been shaped by the cultures of Native Americans, Latin Americans, Africans and Asians. The United States is sometimes described as a "melting pot" in which different cultures have contributed their own distinct "flavors" to American culture.