1. Chapter 27: Human Impact on Earth’s Resources
All living things need basic needs to survive Air, food, water, shelter

2. Complete Vocabulary in your notebook.
1. Exponential Growth 2. Carrying Capacity 3. Limiting factor 4. Global warming 5. Heat Island 6. Greenhouse effect 7. Reclamation 8. Density-independent factor 9. Density-dependent factor 10. Biodiversity 11. Ecosystem 12. Monoculture 13. Deforestation 14. Bioremediation
Read through Chapter 27 Power Point
and take notes to be checked Monday, Nov. 16

3. Resources and Population Growth
As a population increases the demand for natural resources increases
Exponential growth – pattern of growth in which a population grows faster as it increases in size (J-shaped curve), results in population explosion

4. Limits of Population Growth
Limiting factors – cause a population to stop increasing (s-shaped curve)
Availability of food, water, or clean air
Carrying Capacity – number of organisms that any given environment can support
If population size exceeds the carrying capacity temporarily, the number of deaths will increase or the number of births will decrease, until the population size returns to the carrying capacity (equilibrium)

5. Go to page 715 and complete questions 1-4 of the Section Assessment in your notes.

6. Impact on Land Resources - Extraction of Mineral Resources
Surface Mining – mineral and ore deposits found just beneath the Earth’s surface
Underground mining – mineral resources lie deep under the ground. Waste material must be removed & brought to the surface so when rainwater seeps through it takes toxins to the streams.

7. Surface Mining Control and Reclamation Act
Requires mining companies to restore the land to its original contours and to replant vegetation - reclamation

8. Agriculture
Biodiversity – wide variety of different species (forests, parks)
Monoculture – planting of just 1 species
Easier for farmers to sow, fertilize, and harvest crops
Disease can spread more rapidly which will result in the loss of crops

9. Deforestation: clearing of forests without adequate replanting
Clear cutting - the complete removal of all the trees in the area.
(loss of topsoil and clogging streams with excess sediment.
New laws require buffer zones of trees which reduce the amount of runoff.

10. Urban development (Urbanization)
70% of North Americas population lives in urban and suburban areas
Development takes land away from agricultural use, puts pressure on farmland to increase production
Fewer opportunities for rainwater to soak into the ground
Groundwater supplies are not recharged and flooding increases
Produces large volumes of solid wastes

11. Go to page 723 and complete questions 1-4 of the Section Assessment in your notes.

12. Human impact on Air Resources
Smog – type of haze caused when solar radiation from the sun interacts with exhaust from automobiles
Created when nitrogen oxide, carbon monoxide, & hydrocarbons are converted to O3 when exposed to sunlight
Occurs in the form of particulate matter – solid particles in the air such as ash, pollen, dust, asbestos fibers, etc

13. Global impacts
Greenhouse effect – when the Earth’s atmosphere traps energy from the Sun in the troposphere & heats up the earth

14. Global Warming: increase in earth’s average temperature
Global Warming: increase in earth’s average temperature. (burning of fossil fuels)

15. Acid Precipitation
Forms when sulfur dioxide and nitrogen oxides combine with water in the atmosphere to produce sulfuric acid and/or nitric acid. Coal burning power plants Sulfur dioxide can also be added by volcanoes

16. Acid Precipitation
May flow into rivers and lakes causing damage to aquatic life (plants and animals) May change the pH of soil and, over time harm vegetation May weaken trees so that they are more easily harmed by insects and disease May damage stone buildings and statues and corrode metal at a faster rate

17. Ozone Depletion
Layer of ozone in the stratosphere that protects humans from harmful UV radiation Chlorofluorocarbons (CFC’s) destroy ozone Montreal Protocol banned the use of CFC’s CFC’s come from refrigerants, cleaning agents, aerosol, etc.

18. Reducing Air Pollution
Wet Scrubber – device installed at coal-burning power plants to reduce sulfur dioxide and particulate matter emission
Replace older automobiles with newer ones with more efficient engines

19. Go to page 729 and complete questions 1-4 of the Section Assessment in your notes.

20. Go to page 738 and complete questions 1-13 of the Chapter 17 Assessment in your notes.