MILLER/SPOOLMAN 17 TH LIVING IN THE ENVIRONMENT. Chapter 14 Geology and Nonrenewable Mineral Resources
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1 MILLER/SPOOLMAN LIVING IN THE ENVIRONMENT 17 TH Chapter 14 Geology and Nonrenewable Mineral Resources
2 Core Case Study: The Real Cost of Gold Gold producers China South Africa Australia United States Canada Cyanide heap leaching Extremely toxic to birds and mammals Spills contaminate drinking water and kill birds and fish
3 Gold Mine with Cyanide Leach Piles and Ponds in South Dakota, U.S. Fig. 14-1, p. 346
4 14-1 What Are the Earth s Major Geological Processes and Hazards? Concept 14-1 Dynamic processes move matter within the earth and on its surface, and can cause volcanic eruptions, earthquakes, tsunamis, erosion, and landslides.
5 The Earth Is a Dynamic Planet What is geology? Dynamic processes taking place on earth s surface and in earth s interior Three major concentric zones of the earth Core Mantle Including the asthenosphere Crust Continental crust Oceanic crust: 71% of crust
6 Major Features of the Earth s Crust and Upper Mantle Fig. 14-2, p. 348
7 Abyssal hills Oceanic crust (lithosphere) Abyssal floor Oceanic ridge Abyssal floor Trench Volcanoes Folded mountain belt Craton Abyssal plain Continental shelf Continental slope Continental rise Fig. 14-2, p. 348
8 The Earth Beneath Your Feet Is Moving (1) Convection cells, or currents Tectonic Plates Lithosphere
9 The Earth Beneath Your Feet Is Moving (2) Three types of boundaries between plates Divergent boundaries Magma Oceanic ridge Convergent boundaries Subduction zone Trench Transform boundaries: San Andreas fault
10 The Earth s Crust Is Made Up of a Mosaic of Huge Rigid Plates: Tectonic Plates Fig. 14-3, p. 348
11 Spreading center Ocean trench Subduction zone Oceanic crust Oceanic crust Continental crust Material cools as it reaches the outer mantle Cold dense material falls back through mantle Continental crust Mantle convection cell Hot material rising through the mantle Two plates move towards each other. One is subducted back into the mantle on a falling convection current. Hot outer core Inner core Mantle Fig. 14-3, p. 348
12 The Earth s Major Tectonic Plates Fig. 14-4, p. 349
13 JUAN DE FUCA PLATE PACIFIC PLATE COCOS PLATE NORTH AMERICAN PLATE CARIBBEAN PLATE NAZCA PLATE SOUTH AMERICAN PLATE ANATOLIAN PLATE EURASIAN PLATE AFRICAN PLATE ARABIAN PLATE INDIA PLATE SOMALIAN SUBPLATE CHINA SUBPLATE AUSTRALIAN PLATE PHILIPPINE PLATE PACIFIC PLATE SCOTIA PLATE ANTARCTIC PLATE Divergent plate boundaries Convergent plate boundaries Transform faults Fig. 14-4, p. 349
14 The San Andreas Fault as It Crosses Part of the Carrizo Plain in California, U.S. Fig. 14-5, p. 350
15 Some Parts of the Earth s Surface Build Up and Some Wear Down Internal geologic processes Generally build up the earth s surface External geologic processes Weathering Physical, chemical, and biological Erosion Wind Flowing water Human activities Glaciers
16 Volcanoes Release Molten Rock from the Earth s Interior Volcano Fissure Magma Lava 1991: Eruption of Mount Pinatubo Benefits of volcanic activity
17 Creation of a Volcano Fig. 14-6, p. 351
18 Extinct volcanoes Eruption cloud Ash flow Lava flow Mud flow Landslide Ash Acid rain Central vent Magma conduit Magma reservoir Fig. 14-6b, p. 351
19 Earthquakes Are Geological Rock-and-Roll Earthquake Seismic waves Focus Epicenter Magnitude Amplitude Events (1)
20 Earthquakes Are Geological Rock-and-Roll Richter scale Insignificant: <4.0 Minor: Damaging: Destructive: Major: Great: >8.0 Events (2) Largest recorded earthquake: 9.5 in Chile in 1960
21 Major Features and Effects of an Earthquake Fig. 14-7, p. 351
22 Landslides may occur on hilly ground Liquefaction of recent sediments causes buildings to sink Two adjoining plates move laterally along the fault line Earth movements cause flooding in low-lying areas Shock waves Epicenter Focus Fig. 14-7a, p. 351
23 Earthquake Risk in the United States Figure 16, Supplement 8
24 World Earthquake Risk Figure 17, Supplement 8
25 Earthquakes on the Ocean Floor Can Cause Huge Waves Called Tsunamis Tsunami, tidal wave Travels several hundred miles per hour Detection of tsunamis Buoys in open ocean December 2004: Indian Ocean tsunami Magnitude 9.15 and 31-meter waves at shore Role of coral reefs and mangrove forests in reducing death toll
26 Formation of a Tsunami and Map of Affected Area of Dec 2004 Tsunami Fig. 14-8, p. 352
27 Earthquake in seafloor swiftly pushes water upwards, and starts a series of waves Waves move rapidly in deep ocean reaching speeds of up to 890 kilometers per hour. As the waves near land they slow to about 45 kilometers per hour but are squeezed upwards and increased in height. Waves head inland causing damage in their path. Undersea thrust fault Upward wave Bangladesh India Myanmar Thailand Earthquake Sri Lanka Malaysia Sumatra Indonesia December 26, 2004, tsunami Fig. 14-8, p. 352
28 Shore near Gleebruk in Indonesia before and after the Tsunami on June 23, 2004 Fig. 14-9, p. 353
29 14-2 How Are the Earth s Rocks Recycled? Concept 14-2 The three major types of rocks found in the earth s crust sedimentary, igneous, and metamorphic are recycled very slowly by the process of erosion, melting, and metamorphism.
30 There Are Three Major Types of Rocks (1) Minerals Element or inorganic compound in earth s crust Usually a crystalline solid Regular and repeating arrangement of atoms Rock Combination of one or more minerals
31 There Are Three Major Types of Rocks (2) 1. Sedimentary Sediments from eroded rocks or plant/animal remains Transported by water, wind, gravity Deposited in layers and compacted Sandstone Shale Dolomite Limestone Lignite Bituminous coal
32 There Are Three Major Types of Rocks (3) 2. Igneous Forms below or at earth s surface from magma Granite Lava rocks 3. Metamorphic Preexisting rock subjected to high pressures, high temperatures, and/or chemically active fluids Anthracite Slate Marble
33 The Earth s Rocks Are Recycled Rock cycle Very Slowly Slowest of the earth s cyclic processes
34 Natural Capital: The Rock Cycle Fig , p. 354
35 Transportation Erosion Weathering Deposition Sedimentary rock Sandstone, limestone Heat, pressure Igneous rock Granite, pumice, basalt Cooling Heat, pressure, stress Magma (molten rock) Melting Metamorphic rock Slate, marble, gneiss, quartzite Fig , p. 354
36 14-3 What Are Mineral Resources, and What Are their Environmental Effects? Concept 14-3 We can make some minerals in the earth s crust into useful products, but extracting and using these resources can disturb the land, erode soils, produce large amounts of solid waste, and pollute the air, water, and soil.
37 We Use a Variety of Nonrenewable Mineral resource Mineral Resources (1) Can be extracted from earth s crust and processed into raw materials and products at an affordable cost Metallic minerals Nonmetallic minerals Ore Contains profitable concentration of a mineral High-grade ore Low-grade ore
38 We Use a Variety of Nonrenewable Mineral Resources (2) Metallic mineral resources Aluminum Iron for steel Copper Nonmetallic mineral resources Sand, gravel, limestone Reserves: estimated supply of a mineral resource
39 Some Environmental Impacts of Mineral Use Advantages of the processes of mining and converting minerals into useful products Disadvantages
40 The Life Cycle of a Metal Resource Fig , p. 355
41 Mining Metal ore Separation of ore from waste material Smelting Recycling Melting metal Conversion to product Discarding of product Fig , p. 355
42 Surface mining Metal ore Separation of ore from gangue Smelting Melting metal Conversion to product Discarding of product Recycling Stepped Art Fig , p. 355
43 Extracting, Processing, Using Nonrenewable Mineral and Energy Resources Fig , p. 356
44 Natural Capital Degradation Extracting, Processing, and Using Nonrenewable Mineral and Energy Resources Steps Mining Exploration, extraction Processing Transportation, purification, manufacturing Use Transportation or transmission to individual user, eventual use, and discarding Environmental Effects Disturbed land; mining accidents; health hazards; mine waste dumping; oil spills and blowouts; noise; ugliness; heat Solid wastes; radioactive material; air, water, and soil pollution; noise; safety and health hazards; ugliness; heat Noise; ugliness; thermal water pollution; pollution of air, water, and soil; solid and radioactive wastes; safety and health hazards; heat Fig , p. 356
45 There Are Several Ways to Remove Mineral Deposits (1) Surface mining Shallow deposits removed Overburden removed first Spoils: waste material Subsurface mining Deep deposits removed
46 There Are Several Ways to Remove Mineral Deposits (2) Type of surface mining used depends on Resource Local topography Types of surface mining Open-pit mining Strip mining Contour strip mining Mountaintop removal
47 Natural Capital Degradation: Open-Pit Mine in Arizona Fig , p. 357
48 Area Strip Mining in Wyoming Fig , p. 357
49 Natural Capital Degradation: Contour Strip Mining Fig , p. 358
50 Undisturbed land Overburden Pit Bench Spoil banks Fig , p. 358
51 Mining Has Harmful Environmental Effects (1) Scarring and disruption of the land surface E.g., spoils banks Mountain top removal for coal Loss of rivers and streams Air pollution Groundwater disruption Biodiversity decreased
52 Mining Has Harmful Environmental Effects (2) Subsurface mining Subsidence Acid mine drainage Major pollution of water and air Effect on aquatic life Large amounts of solid waste
53 Spoils Banks in Germany from Area Strip Mining Fig , p. 358
54 Mountaintop Coal Mining in West Virginia Fig , p. 359
55 Ecological Restoration of a Mining Site in Indonesia Fig , p. 360
56 Removing Metals from Ores Has Harmful Environmental Effects (1) Ore extracted by mining Ore mineral Gangue = waste material Smelting using heat or chemicals Air pollution Water pollution
57 Removing Metals from Ores Has Harmful Environmental Effects (2) Liquid and solid hazardous wastes produced Use of cyanide salt of extract gold from its ore Summitville gold mine: Colorado, U.S.
58 Individuals Matter: Maria Gunnoe West Virginia environmental activist Won $150,000 Goldman Environmental Prize for efforts against mountaintop coal mining Her home Flooded 7 times Coal sludge in yard Well contaminated
59 14-4 How Long Will Supplies of Nonrenewable Mineral Resources Last? Concept 14-4A All nonrenewable mineral resources exist in finite amounts, and as we get closer to depleting any mineral resource, the environmental impacts of extracting it generally become more harmful. Concept 14-4B Raising the price of a scarce mineral resource can lead to an increase in its supply, but there are environmental limits to this effect.
60 Mineral Resources Are Distributed Unevenly (1) Most of the nonrenewable mineral resources supplied by United States Canada Russia South Africa Australia Sharp rise in per capita use in the U.S.
61 Mineral Resources Are Distributed Unevenly (2) Strategic metal resources Manganese (Mn) Cobalt (Co) Chromium (Cr) Platinum (Pt)
62 Supplies of Nonrenewable Mineral Resources Can Be Economically Depleted (1) Future supply depends on Actual or potential supply of the mineral Rate at which it is used
63 Supplies of Nonrenewable Mineral Resources Can Be Economically Depleted (2) When it becomes economically depleted Recycle or reuse existing supplies Waste less Use less Find a substitute Do without Depletion time: time to use a certain portion of reserves
64 Natural Capital Depletion: Depletion Curves for a Nonrenewable Resource Fig , p. 361
65 Production A Mine, use, throw away; no new discoveries; rising prices Recycle; increase reserves by improved mining technology, higher prices, and new discoveries B C Recycle, reuse, reduce consumption; increase reserves by improved mining technology, higher prices, and new discoveries Present Depletion time A Depletion time B Time Depletion time C Fig , p. 361
66 Production A Mine, use, throw away; no new discoveries; rising prices B C Recycle; increase reserves by improved mining technology, higher prices, and new discoveries Recycle, reuse, reduce consumption; increase reserves by improved mining technology, higher prices, and new discoveries Present Depletion time A Depletion time B Time Depletion time C Stepped Art Fig , p. 361
67 Market Prices Affect Supplies of Nonrenewable Minerals Subsidies and tax breaks to mining companies keep mineral prices artificially low Does this promote economic growth and national security? Scarce investment capital hinders the development of new supplies of mineral resources
68 Case Study: The U.S. General Mining Law of 1872 Encouraged mineral exploration and mining of hardrock minerals on U.S. public lands Developed to encourage settling the West (1800s) Until 1995, land could be bought for 1872 prices Companies must now pay for clean-up
69 Colorado Gold Mine Must Be Cleaned up by the EPA Fig , p. 363
70 Is Mining Lower-Grade Ores the Answer? Factors that limit the mining of lower-grade ores Increased cost of mining and processing larger volumes of ore Availability of freshwater Environmental impact Improve mining technology Use microorganisms, in situ Slow process What about genetic engineering of the microbes?
71 Can We Extend Supplies by Getting More Minerals from the Ocean? (1) Mineral resources dissolved in the ocean -- low concentrations Deposits of minerals in sediments along the shallow continental shelf and near shorelines
72 Can We Extend Supplies by Getting More Minerals from the Ocean? (2) Hydrothermal ore deposits Metals from the ocean floor: manganese nodules Effect of mining on aquatic life Environmental impact
73 Natural Capital: Hydrothermal Deposits Fig , p. 364
74 Black smoker White smoker Sulfide deposits White crab Magma White clam Tube worms Fig , p. 364
75 14-5 How Can We Use Mineral Resources More Sustainability? Concept 14-5 We can try to find substitutes for scarce resources, reduce resource waste, and recycle and reuse minerals.
76 We Can Find Substitutes for Some Scarce Materials revolution Mineral Resources (1) Nanotechnology Ceramics High-strength plastics Drawbacks?
77 We Can Find Substitutes for Some Scarce Mineral Resources (2) Substitution is not a cure-all Pt: industrial catalyst Cr: essential ingredient of stainless steel
78 Science Focus: The Nanotechnology Revolution Nanotechnology, tiny tech Uses Nanoparticles Are they safe? Investigate potential ecological, economic, health, and societal risks Develop guidelines for their use until more is known about them
79 Recycling We Can Recycle and Reuse Valuable Metals Lower environmental impact than mining and processing metals from ores Reuse
80 Aluminum Cans Ready for Recycling Fig , p. 366
81 We Can Use Mineral Resources More Sustainability How can we decrease our use and waste of mineral resources? Pollution and waste prevention programs
82 Solutions: Sustainable Use of Nonrenewable Minerals Fig , p. 366
83 Case Study: Pollution Prevention Pays Begun in 1975 by 3M company, a very large manufacturing company Redesigned equipment and processes Fewer hazardous chemicals Recycled or sold toxic chemical outputs Began making nonpolluting products Company saved $1.2 billion Sparked cleaner production movement
84 Three Big Ideas 1. Dynamic forces that move matter within the earth and on its surface recycle the earth s rocks, form deposits of mineral resources, and cause volcanic eruptions, earthquakes, and tsunamis. 2. The available supply of a mineral resource depends on how much of it is in the earth s crust, how fast we use it, mining technology, market prices, and the harmful environmental effects of removing and using it.
85 Three Big Ideas 3. We can use mineral resources more sustainably by trying to find substitutes for scarce resources, reducing resource waste, and reusing and recycling nonrenewable minerals.
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