C12
- Created by: khwaab
- Created on: 05-04-20 06:17
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- The Earths Resources
- Using the Earth's Resources
- Potable Water
- Water is potable if it is safe for human consumption. Water does not have to be chemically pure (consist solely of H2O molecules) to be potable.
- To make water potable, reduce the concentration of dissolved minerals and salts, and microbes found in the water.
- Potable water can be obtained from:
- Fresh water only needs filtering and sterilising.It is the easiest source to treat.
- Seawater is the most expensive source to treat because of the large amounts of energy needed to desalinate the water.
- Treatment of waste water involves many steps.Less energy is used to treat waste water than to desalinate seawater.
- Potable water can be obtained from:
- To make water potable, reduce the concentration of dissolved minerals and salts, and microbes found in the water.
- Water is potable if it is safe for human consumption. Water does not have to be chemically pure (consist solely of H2O molecules) to be potable.
- Natural Resources
- Natural resources form without human assistance (involvement). They usually come from the Earth’s crust, oceans or atmosphere and are used for energy, building materials and food
- Renewable resources are regenerated at about the same rate as, or faster, than they're used. Examples include: Timber. Fresh water. Food.
- Non-renewable resources are regenerated at a much slower rate than we use them. Examples include: Fossil fuels. Nuclear fuels. Metal ores.
- Supplements to natural resources
- Agriculture
- Larger quantities of food produced
- Synthetic products
- Reduced reliance on natural products
- Agriculture
- Natural resources form without human assistance (involvement). They usually come from the Earth’s crust, oceans or atmosphere and are used for energy, building materials and food
- Sources of waste water
- Sewage treatment
- Screening
- Sedimentation
- Light effluent
- Aerobically digested by bacteria
- Heavy sludge
- Anaerobically digested by bacteria
- Light effluent
- Sedimentation
- Screening
- Agriculture
- Contains organic matter and harmful microbes
- Domestic
- Contains organic matter and harmful microbes
- Industry
- Harmful chemicals
- Sewage treatment
- Metal Ores
- Extraction
- Mining
- Pollution
- Landscape scars
- Habitat destruction
- Alternative Methods of Extracting Copper
- Phytomining
- Plants growing on contaminated land absorb copper ions as they grow. These plants are harvested and burned, producing ash that contains a high concentration of copper compounds.
- Bioleaching
- Bacteria are mixed in with low-grade ores. The bacteria convert the copper into a solution rich in copper compounds called leachate solution
- Phytomining
- Mining
- Finite
- Extraction
- Potable Water
- Life Cycle Assessments and Recycling
- LCA
- 1) Acquiring raw materials 2) Manufacture and packaging 3) Product use 4) Product disposal
- Life Cycle Assessments (LCAs) assess every stage of a product’s lifetime in order to evaluate total environmental costs
- Comparative LCAs have shown that paper bags may actually be more harmful than plastic bags as their manufacture requires more energy and their lifespan is far shorter.
- Difficulties associated with LCAs - Subjective elements Missing detail
- Recycling
- The use of resources can be reduced by reusing and recycling existing materials, or just by encouraging people to use them less.
- Steps in the process of recycling metals: Melt Reshape
- Steps involved in recycling glass: Crush Sort Melt Reshape
- LCA
- Using the Earth's Resources
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