The four main Native American culture groups of Poverty Point, Mississippian, Hopewell, and Adena are collectively known as _______ _____ civilizations. Historically, they were located in the eastern half of the United States.
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Question 2The ______ _______ is the common name used to refer to an eight-year drought during the 1930s that ruined crops and livelihoods causing mass migrations from Oklahoma and surrounding areas.
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Question 3A/an _______ is a precipitation-related natural weather disaster involving a combination of snowfall and high winds.
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Question 4The _______ ______ an extensive region making up much of northern and central Canada underlain by Precambrian (up to 3 billion years old) rocks.
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Question 5A/an__________ is a chain of metropolitan areas with a combined population of over 10 million.
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Question 6_______-____________ game, in which any benefit to one party equals a loss to another party. The California water allocation is a classic example.
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