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Science 20

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  1. Science 20

  2. Quiz • What is the benefits of wildfire according to the paragraph “Wildfires and the Water Cycle?” • If water is continually recycled, why is it important to conserve according to the “Human Impacts on the Water Cycle?” • What other human impacts affects the environment?

  3. Water has the greatest influence on life found in ecosystems. • Transpiration – the loss of water vapour from a plant through its leaves • Humidity – the atmosphere’s moisture content

  4. Wildfires and the water cycle • Hydrocarbon compounds are distilled into their constituent parts. • They move down into the soil, then form a waxy coating that is waterproof. • The ability of forests to absorb and hold water is reduced, not only because soil is a waterproof layer but because vegetation that uses the water has been damaged

  5. Human Impacts on the Water Cycle • Water being conserved has to do with the fact that when humans remove fresh water from the environment, it is very difficult to return the water to the environment without a deterioration in quality. • Water becomes polluted • Deforestation is another major way in which people

  6. Recycling of Other Elements and Compounds • Atoms of carbon, nitrogen, oxygen, and other elements that make up bodies of living organisms • Recycled by Biogeochemical cycles • A diagram representing the movement of elements and compounds between living and non-living components of an ecosystem

  7. The Carbon Cycle

  8. Photosynthesis – the process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches • Cellular Respiration – the process by which cells convert the chemical energy stored in sugars into energy that the cells can use

  9. Carbon Sink – a systems that removes more carbons dioxide from the atmosphere that it releases into the atmosphere • Peat – deep layers of mosses and plant remains unable to completely decompose due to the lack of oxygen in water-saturated soil.

  10. Human Impact on the Carbon Cycle • Burning of fossil fuels have the effect on this cycle • Why do you think this would happen! Answer with you table partner to be passed in.

  11. Human impact on the Carbon Cycle • Deforestation affects the carbon cycle by eliminating trees that could absorb carbon dioxide through photosynthesis. • Also leads to an increase in soil temperature extremes and a decrease in soil moisture a

  12. Impact of Wildfires on the Carbon Cycle • Burning forest switches instantly from a carbon sink into a carbon source with the addition of carbon dioxide to the atmostphere