Day 11 – Threats to Sustainability

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Presentation transcript:

Day 11 – Threats to Sustainability SCI 10 Ecosystems

Review for Quiz Thurs p.311 #14 p.312 #6, 8, 20, 22, 26

Matter and energy are recycled through all four of Earth’s systems – lithosphere, the hydrosphere, the atmosphere, and the biosphere. Water cycle, carbon cycle, nitrogen cycle, phosphorus cycle, etc. No new matter has been created since the formations over 4 billion years ago

Eutrophication http://www.youtube.com/watch?v=LrCVrR5G5vY Octonauts 0:53-2:30

Eutrophication Caused by run off of nitrogen and phosphorus into waterways (usually from fertilizer use) Commonly found close to golf courses and farmlands

The process Eutrophication: deposits of excess nutrients in bodies of water that result in large increases in plant growth Phosphates and nitrogen from fertilizers, or sewage, run off into bodies of water These nutrients stimulate excessive algae growth = ALGAL BLOOM The algae die off and sink to the bottom where they are decomposed by bacteria Bacteria use CELLULAR RESPIRATION to decompose the algal remains which uses up most of the OXYGEN at the bottom Other fish who live near the bottom die due to lack of oxygen The algae bloom blocks sunlight and prevents plants from deeper down from PHOTOSYNTHESIZING

Carbon Dioxide and Other Greenhouse Gases

Greenhouse gases gases that prevent heat from leaving the atmosphere (carbon dioxide CO2, methane CH4, etc.) The greenhouse effect: increased amount of greenhouse gases in our atmosphere leading to an increase in the temperature of Earth

Most matter has cycled through the biosphere countless times Small amounts have escaped and settled in where there is not enough oxygen to decompose them. With pressure and heat the materials changed into fossil fuels – Carbon, petroleum and natural gas

p.305 Effects of Imbalance in Carbon Cycle

To Do p.311 #4, 6, 13 (don’t write a letter), 14 Review for Quiz Thurs