Blog week 3 - 1
 Guns, Germs, and Steel
·     Early River Valley Civilizations 3500 B.C. – 450 B.C.
·     The earliest civilizations formed on fertile river plains.
·     These lands faced challenges, such as seasonal flooding and a limited growing area.
·     Early civilizations developed bronze tools, the wheel, the sail, the plow, writing, and mathematics.
·     Fertile Crescent àMesopotamia
·     Environmental Challenges
o  Unpredictable flooding.
o  A period of time with little to no rain.
o  No natural barriers for protection.
o  Natural resources were limited and building materials or other necessary items were scarce.
·     “Land between rivers” (translated from Greek)
·     Environmental challenges solutions
o  They dug irrigation ditches to store water during droughts.
o  They built city walls with mud bricks.
o  They traded crops, for materials.

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