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Quiz/Review

Quiz/Review. Get out a small piece of paper and put your name on it. When the bell rings, the quiz will begin. Question 1. How many major mass extinctions have there been?. Question 2. How many species were alive that are now extinct?. Question 3. What could cause a mass extinction?.

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Quiz/Review

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  1. Quiz/Review • Get out a small piece of paper and put your name on it. • When the bell rings, the quiz will begin.

  2. Question 1 • How many major mass extinctions have there been?

  3. Question 2 • How many species were alive that are now extinct?

  4. Question 3 • What could cause a mass extinction?

  5. Answers • 5 mass extinctions • 90% of everything alive is now dead • Impact, climate change, sea level changes, volcanism.

  6. Dust Bowl "Houses were shut tight, and cloth wedged around doors and windows, but the dust came in so thinly that it could not be seen in the air, and it settled like pollen on the chairs and tables, on the dishes.” ~ John Steinbeck (from "The Grapes of Wrath")

  7. Maps

  8. What is the dust bowl • Very large drought • 1930-1940 about ten years.

  9. What is a drought • A drought is a period of little or no precipitation. • Where do they occur?

  10. What causes them • Obviously lower then normal precipitation. • Volcanoes, El Nino/La Nina, People?? • About every 22 years in the west • Most places restrict your water consumption and use during a drought.

  11. What causes this event? • The pacific ocean was cooler than normal and the Atlantic was warmer then normal. • How did this affect the area? • Created a drought and unstable • Normal moisture supply was reduced from the Gulf of Mexico (caused by a weakened jet stream)

  12. Who is affected? • Millions of land was over farmed and poorly managed. • 500,000 left homeless • 75% of the topsoil was blown away

  13. Possible Warning • There was no warning for this event. • Poor farming practices, deforestation added to the wind speeds. • Droughts cannot be predicted , but understanding the past would have helped.

  14. What ended the dust bowl • Jet stream strengthened. • Increased moisture • Bombs? • Trees were placed on the plains to block the wind.

  15. What If... • 1856-65 had it worst but population was much lower in the same area. • 1988 & 1993 had severe droughts but not as damaging as dust bowl. "What’s past is prologue" is a quotation by William Shakespeare

  16. Works Cited • http://en.wikipedia.org/wiki/Dust_Bowl • http://www.english.illinois.edu/maps/depression/dustbowl.htm • http://www.livinghistoryfarm.org/farminginthe30s/water_02.html • http://en.wikipedia.org/wiki/Drought_in_the_United_States • http://andrewsullivan.thedailybeast.com/2012/week30/index.html

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