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10/1/13

Objective : SWBAT describe the characteristics and importance of the hydrologic cycle. Due Now: Ocean Zones chart, Freshwater questions Do Now : Practice AP FRQ : Be prepared to grade your own! You don’t have to write the question.

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10/1/13

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  1. Objective: • SWBAT describe the characteristics and importance of the hydrologic cycle. Due Now:Ocean Zones chart, Freshwater questions Do Now: Practice AP FRQ: Be prepared to grade your own! You don’t have to write the question. List and describe four ways that humans impact freshwater ecosystems. 10/1/13 Agenda: • Chapter 8Quiz • Importance of Water • Practice FRQ Life’s Work: Read ch. 11 and study for quiz Friday

  2. Score Your Own FRQ4 points total Describe FOUR ways that humans have affected freshwater ecosystems, not just list; 1 point for each described; score only the first four.

  3. Deejays suspended for "dihydrogen monoxide" April Fools joke Mark Frauenfelder at 7:25 am Thu, Apr 4, 2013 Jim Leftwich says: "Two Deejays for "Gator Country 101.9" warned that 'dihydrogen monoxide' was coming out of peoples' water faucets. Georgians panicked.

  4. “Water is the driver of nature.”- Leonardo da Vinci Without water, the other nutrient cycles would not exist in their present forms, and life on earth could not exist.

  5. What Makes Water so Special?Unique Properties of H2O

  6. Why is Water Important? • Water keeps us alive, moderates climate, sculpts the land, removes and dilutes wastes and pollutants, and moves continually through the hydrologic cycle. • Only about 0.02% of the earth’s water supply is available to us as liquid freshwater.

  7. How Do We Use Water? • 70% Irrigation: watering crops • 20% Industry: cooling down power plants • 10% Domestic and Municipal: drinking, sewage, bathwater, dishwater, & laundry

  8. So Do We Use Water Responsibly? • We currently use more than half of the world’s reliable runoff of surface water and could be using 70-90% by 2025. • About 70% of the water we withdraw from rivers, lakes, and aquifers is not returned to these sources. • Why does this matter? There is only a limited amount of water available on Earth!

  9. Unconfined Aquifer Recharge Area Evaporation and transpiration Evaporation Precipitation Confined Recharge Area Runoff Flowing artesian well Recharge Unconfined Aquifer Stream Well requiring a pump Water table Infiltration Lake Infiltration Unconfined aquifer Less permeable material such as clay Confined aquifer Confining impermeable rock layer Fig. 14-3, p. 308

  10. Hydrologic Cycle Basics

  11. Surface Water • Comes from precipitation • Examples: streams, rivers, and lakes • Watershed flow: small streams  larger streams  rivers  sea • Tributary: river or stream flowing into a larger river or stream

  12. Freshwater Streams and Rivers:From the Mountains to the Oceans • Water flowing from mountains to the sea creates different aquatic conditions and habitats. Figure 6-17

  13. Headwater Stream • A narrow zone of cold, clear water that rushes over waterfalls and rapids. • Large amounts of oxygen are present. • Fish are also present. Ex. trout.

  14. Downstream • Slower-moving water • Less oxygen • Warmer temperatures • Lots of algae and cyanobacteria.

  15. Groundwater • Aquifers: porous rock with water flowing through • Water Table: the level of earth’s land crust to which the aquifer is filled • Renewability: the circulation rate of groundwater is slow (300 to 4,600 years). • Why is knowing renewability rates important?

  16. Practice AP FRQ (16 minutes)2002 - #2 • On a separate sheet of paper, complete questions (a) and (b). • Be prepared to grade your own response. • Do not use your notes.

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