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The Water and Phosphorus Cycles

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Presentation on theme: "The Water and Phosphorus Cycles"— Presentation transcript:

1 The Water and Phosphorus Cycles
By: Maren Hamby Megan Whitley Sebastian Belk Ashley Dolan

2 The Water Cycle

3 Water Cycle The water cycle, also known as the hydrologic cycle, collects, cleans, and circulates all of the earth’s water supply. The water cycle is powered by the sun and by gravity.

4 Water Cycle

5 Water Cycle Organic reservoirs Inorganic reservoirs Lakes Rivers
Streams Oceans Water tables Inorganic reservoirs Man made dams Cisterns

6 Pathway of Movement Evaporation: water to water vapor
Transpiration: evaporation of water from plants Condensation: water vapor to water drops Precipitation: rain, sleet, hail, and snow Infiltration: water soaks into soil Percolation: water in soil moves to aquifers Runoff: movement back to sea

7 Impact of Human Intervention On the Water Cycle
Take water from streams, lakes, oceans, etc. Underground water depletion Oceans salts move to underground fresh water Modify water quality Change the processes that purify water naturally Add nutrients and other pollutants like phosphates and nitrates in fertilizers

8 Impact of Human Intervention On the Water Cycle
Clear land for mining, road and building construction, agriculture Increase runoff Reduces infiltration in ground water Increase risk of flooding Increase soil erosion and land slides

9 Phosphorous Cycle

10 Pathway of Movement Salt phosphates are in water or in rock formations
Released and absorbed by plants Animals eat the plants Animals die and the phosphorous returns to the ocean and rock formations where it stays for a long time Does not circulate through atmosphere Very slow process

11 Chemical Reactions When absorbed by plants, converted to ATP (adenosine triphosphate) for energy When animals eat plants phosphate is incorporated into: ATP DNA Teeth Bones

12 Phosphorus Cycle Organic reservoirs Inorganic reservoirs Bones Teeth
ATP DNA Inorganic reservoirs rocks

13 Impact of Human Intervention On the Phosphorus Cycle
Mining phosphate rock for use in inorganic fertilizers and detergents Reducing phosphates in forests by removing trees Phosphorus and other nutrients are washed away and the land becomes unproductive

14 Impact of Human Intervention On the Phosphorus Cycle
Add excess phosphate to aquatic ecosystems through: Runoff from animal wastes Runoff of fertilizers from croplands Too much can cause explosive growth of: Cyanobacteria Algae Aquatic plants When they die and decompose they use up dissolved oxygen and disrupt aquatic life

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