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Unit 3

Unit 3. a supply of anything gathered at maturity and stored. How we obtain Earth’s resources: I. Harvesting. 1.5 billion people in the world still use wood as their primary source of fuel. Leads to deforestation. Results in erosion of topsoil. a. Wood.

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Unit 3

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  1. Unit 3

  2. a supply of anything gathered at maturity and stored How we obtain Earth’s resources: I. Harvesting

  3. 1.5 billion people in the world still use wood as their primary source of fuel. • Leads to deforestation. • Results in erosion of topsoil. a. Wood

  4. Peat spongy light material. Several thousands of years old. Peat is formed in a bed of an ancient bog. Takes thousands of years to form A non-renewable resource….why? b. Peat

  5. II. Drilling

  6. Disturb vegetation and soils to get fuel Require roads, clearing and leveling an area to make a drill pad. Pipelines are needed to transport the gas from the wells. Wastes are produced. a. Natural gas b. oil

  7. Natural gas and oil

  8. www.bio.miami.edu/beck/esc101/Chapter14&15.ppt

  9. Removal of a mineral from Earth’s ground. Mineral a solid substance that is found in nature and consists of a single element or compound. III. Mining

  10. Coal is a non-renewable resource It has to be mined Burning coal releases carbon dioxide (CO2) and other toxins Coal ash is toxic a. Coal

  11. Open-pit mining machines are used to dig large holes in the ground and remove the ore (mineral containing rock). Strip mining huge bulldozers and other machines are used to clear away large strips of Earth’s surface. Surface mining methods

  12. Open pits

  13. At 215 m deep and 1.6 km in circumference, the “Big Hole” at the Kimberley Mine in South Africa is the largest hand-dug excavation in the world. By the time the mine closed in 1914, 22.5 million tons of rock had yielded almost 3,000 kg of diamonds.

  14. Strip Mining

  15. - Mineral is deep underground. • Less disruptive to the Earth’s surface. Subsurface mining

  16. Disruption of the land • Land erosion and land slides • Pollution and wastes • Very toxic and ponds created for these wastes often leak. Effects of mining

  17. Orange slime — containing iron, cadmium, aluminum, mercury, zinc and lead — coats the walls of the mine 4 inches thick. A former waste pond at the Penn mine during a tour of the mine and the polluted water source near Keystone, Colo.

  18. Reclamation requiring mining companies to restore mined land.*surface mining control and reclamation act of 1977* Responsible Mining

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