arid - very dry, Sahara Desert - less than 4" rain per year, Atlas Mountains - tip of NW Africa, Zagros Mountains - in Iran, Fertile Crescent - arc /area surrounding Tigris and Euphrates Rivers, Euphrates River - longest river is SW Asia, Tigris River - has unpredictable speeds and causes major flooding, silt - fine particles of fertile soil, irrigation - channels to direct water to crops, Rub al Khali - means "Empty Quarter", Arabian Peninsula - surrounded by water but is mostly desert, petroleum - unrefined oil, nonrenewable resource - not able to reproduce quickly, 130 degrees farenheit - Sahara Desert's average temperature, Nile River - some of the oldest civilizations settled here, alluvial plain - fertile area from flooding rivers, Arabian Peninsula - over 1 million square miles, Arabian Peninsula - about 25% of world's petroleum is here,

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