How Human Activities affect the Environment

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How Human Activities affect the Environment
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I.Deforestation

• A. Definitionlarge areas of land are logged
• Problems
• B. flooding
• C. landslides and mudslides can occur
• D. topsoil is washed away
• E. trees are also an important component of the
  water cycle
• F. forests home to a large number of animals

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II.Strip Mining

• a. Definitionsurface mining that involves
  excavating earth, rock, and other material
• b.Problems
• 1.water pollution
• 2.landslides
• 3.fires
• 4.hazards to public health and safety

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Interactive Poster

• http//www.energiaklub.hu/dl/interaktiv/fossil.swf
  

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III.Over harvesting

• A.Definitionremoval of plants or animals to the
  point that it is challenging to maintain viable
  population level 
• B.Problems
• 1.imbalance in the food chain
• 2.coming to an end or dying out of a species

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IV. Pollution

• A. Definitionadding harmful substances or
  products into the environment including
• water
• air
• soil
• noise
• B.Problems
• respiratory diseases in human beings
• migratory birds may change their course
• decrease in a number of large life forms
• noise pollution leads to increase in stress,
  anxiety and problems related to hearing

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Brain Pop

• Air Pollution http//www.brainpop.com/science/ourf
  ragileenvironment/airpollution/
• Water Pollution
• http//www.brainpop.com/science/ourfragileenvironm
  ent/waterpollution/

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Acid Rain

• Definitionprecipitation (rain, snow, or sleet)
  containing  high concentrations of acid-forming
  chemicals (coal smoke, chemical manufacturing)
  that have been released into the atmosphere and
  combined with water vapor
• Problems
• damage of trees at high elevations
• decay of building materials and paints, including
  irreplaceable buildings, statues, and sculptures
• harmful to public health

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Experiments on Acid Rain

• Experiment 1 1.   Place a piece of chalk in
  pan. 2.   Using an eyedropper, have one student
  drop vinegar      onto the chalk in a constant
  stream. 3.   Observe the fizzing on the surface
  of the chalk      when the vinegar is
  dropped. 4.   Notice the crumbling of the chalk.

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Experiment 2
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Oil Spills

• Definitionan accidental release of oil
• Problems
• hypothermia in birds and marine mammals
• marine mammals and birds become easy prey
• birds and animals sink or drown
• wild life can not feed due to contamination of
  their environment
• damage to the insides of animals and birds bodies
  

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United Streaming

• Oil Spills 0147 http//player.discoveryeducatio
  n.com/index.cfm?guidAssetId24E13239-7B72-4D62-9B8
  4-70D4A3CEE511blnFromSearch1productcodeUS

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Ozone Depletion

• Definitiona decrease in the ozone that protects
  us from the harmful ultraviolet (UV) rays of the
  sun caused by man-made chemicals that are
  released in the atmosphere
• Problems
• UV rays can destroy a type of bacteria known as
  Cyanobacteria which produces much of Earth's
  oxygen.
• Exposure to  harmful  UV rays can cause skin
  cancer and cataracts.
• An excess level of UV rays could lead to the
  death of the phytoplanktons, that are an
  important component of the food web of the
  oceans.

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Global Warming

• Definitionincrease in the temperatures of the
  earth due to release of greenhouse gases like
  carbon dioxide and methane from industries and
  vehicles
• Problems
• Glacier melting causes flooding to the low lying
  areas including Bangladesh, parts of Africa and
  even major cities like London and New York.
• changing weather patterns around the world

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Brain Pop

• http//www.brainpop.com/science/ourfragileenvironm
  ent/globalwarming/

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EekoWorld

• http//pbskids.org/eekoworld/index.html?loadair_w
  ater