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Section 13-5 Cycles Write everything that is underlined.

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Presentation on theme: "Section 13-5 Cycles Write everything that is underlined."— Presentation transcript:

1 Section 13-5 Cycles Write everything that is underlined

2 13.5 Cycling of Matter KEY CONCEPT: Matter cycles in and out of an ecosystem.

3 13.5 Cycling of Matter I. The Water Cycle 1. The hydrologic, or water cycle is the circular pathway of water on Earth. precipitation condensation transpiration evaporation water storage in ocean surface runoff lake groundwater seepage

4 13.5 Cycling of Matter 2. Key terms for the water cycle: a.Precipitation: moisture that falls to the ground (rain, snow, sleet, hail) b.Evaporation: changing from liquid to gas (water to water vapor) c.Transpiration: plants give off water vapor from their leaves to the air d.Condensation: changing from gas to a liquid (little water droplets form on the outside of a cold glass of lemonade - thats condensation)

5 13.5 Cycling of Matter II. Oxygen Cycle: 1. Plants make food by photosynthesis 1. Plants make food by photosynthesis –They use carbon dioxide (CO 2 ) to make oxygen (O 2 ) 2. Animals breathe out carbon by respiration 2. Animals breathe out carbon by respiration –They use oxygen (O 2 ) and breathe out carbon dioxide (CO 2 ) –By the way … humans are animals too

6 13.5 Cycling of Matter Example: Oxygen Cycle:oxygenrespiration carbondioxide photosynthesis

7 13.5 Cycling of Matter Activity Draw, label, color, and explain the water cycle and oxygen cycles on a sheet of paper.Draw, label, color, and explain the water cycle and oxygen cycles on a sheet of paper. Page 413 figure & 13.13Page 413 figure & Due tomorrowDue tomorrow

8 13.5 Cycling of Matter III. Carbon Cycle 1. Carbon is the building block of life. a.The carbon cycle moves carbon from the atmosphere, through the food web, and returns to the atmosphere. b.Carbon is emitted by the burning of fossil fuels (like oil, gasoline, and coal)

9 13.5 Cycling of Matter Carbon Cycle: notice photosynthesis and respiration are back … they both involve CO 2 (now were looking at the C for carbon) fossil fuels photosynthesis carbon dioxide dissolved in water decomposition of organisms respirationcarbondioxide in air photosynthesis combustion respiration

10 13.5 Cycling of Matter nitrogen in atmosphere animals denitrifying bacteria nitrifying bacteria nitrifying bacteria ammonium ammonification decomposers plant nitrogen-fixing bacteria in soil nitrogen-fixing bacteria in roots nitrates nitrites IV. The Nitrogen Cycle 1.The nitrogen cycle mostly takes place underground. 2.Some bacteria convert gaseous nitrogen into ammonia through a process called nitrogen fixation. –Some nitrogen- fixing bacteria live in nodules on the roots of plants; others live freely in the soil.

11 13.5 Cycling of Matter 3.Ammonia released into the soil is transformed into ammonium. 4.Nitrifying bacteria change the ammonium into nitrate. nitrogen in atmosphere animals denitrifying bacteria nitrifying bacteria nitrifying bacteria ammonium ammonification decomposers plant nitrogen-fixing bacteria in soil nitrogen-fixing bacteria in roots nitrates nitrites –Nitrogen moves through the food web and returns to the soil during decomposition.

12 13.5 Cycling of Matter geologic uplifting rain weathering of phosphate from rocks runoff sedimentation forms new rocks leaching phosphate in solution animals plants decomposers phosphate in soil V. Phosphate Cycle 1.Phosphate is released by the weathering of rocks. Phosphorus leaches into groundwater from the soil and is locked in sediments. a. Phosphorus leaches into groundwater from the soil and is locked in sediments. b. Both mining and agriculture add phosphorus into the environment.

13 13.5 Cycling of Matter Activity Draw, label, color, and explain the Carbon and Nitrogen cycles on a sheet of paper.Draw, label, color, and explain the Carbon and Nitrogen cycles on a sheet of paper. Page figure & 13.15Page figure & Due tomorrowDue tomorrow

14 13.5 Cycling of Matter Review Questions 13.5 Cycling of Matter 1.What is the key concept of this unit? 2.Define the key terms for the water cycle. 3.What do plants take in and then give out. What do animals take in and give out? 4.How does the carbon cycle move carbon? 5.Where is carbon emitted? 6.Where does the nitrogen cycle take place 7.What are phosphates released by?


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