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Our Natural Resources, Then and Now

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Title: Our Natural Resources, Then and Now


1
Our Natural Resources, Then and Now
  • Modified by Georgia Agricultural Education
    Curriculum Office
  • June, 2002

2
What is a natural resource?
  • Any form of energy which can be used by humans.
  • Those things that people come in contact with
    that may be used to perform any useful function.
  • Objects, materials, creatures, or energy found in
    nature that can be put to use by humans.

3
Usefulness Changes
  • A. Things that affect our definition of
    usefulness.
  • 1. Religion- Hindu- cattle
  • 2. Custom- Dogs as food source.
  • 3. Technology and Science

4
Soil Resources
  • A. Land area
  • 1. U.S. 3,675,545 square miles or 2.26 billion
    acres
  • 2. Surface ranges from 282 feet below sea level
    in Death Valley to 20,320 feet above sea level on
    Mt. McKinley

5
Soil Resources
  • 3. Topsoil- uppermost layer of soil from which we
    get almost all of our food and natural fibers.
  • 4. Today, almost 1/3 of our land area is not
    suited for farming 8 covered by cities,
    factories, homes and highways 60 is suited for
    food and fiber production of that only 17 can be
    used to grow crops.

6
Soil Resources
  • B. Erosion
  • 1. Since colonial times we have lost 1/3 of our
    topsoil to erosion.
  • 2. Only 1/4 of our cropland is undamaged by
    erosion.

7
Soil Resources
  • B. Erosion
  • 1. Since colonial times we have lost 1/3 of our
    topsoil to erosion.
  • 2. Only 1/4 of our cropland is undamaged by
    erosion.

8
Soil Resources
  • C. Urban expansion
  • 1. Land is converted to business or home usage.
  • 2. Compaction results from concrete or other
    paving materials.
  • 3. We must establish priorities for land use to
    balance food an d fiber production and industrial
    uses of our land.

9
Water Resources
  • A. Useable Water
  • 1. Earth is 70 water, how much is useable?
  • 2. As a power source water was used to carry
    logs, float boats, turn water wheels

10
Water Resources
  • 3. Everyday we use 300 billion gallons of water
  • a. 60 billion depleted
  • b. 240 billion return to the hydrologic cycle
  • c. Much is damaged by heat and pollutants

11
Water Resources
  • B. Controlling excess runoff
  • 1. 37 states have average annual runoff of more
    than 10 inches
  • 2. Much of the rain that falls, runs directly
    into the sea

12
Water Resources
  • C. Major water problems
  • 1. Control
  • 2. Quality
  • 3. Distribution

13
Fish and Wildlife Resources
  • A. Non-domesticated animals, either game or
    nongame.
  • 1. Considered renewal - only true while the
    species is alive and reproducing.

14
Fish and Wildlife Resources
  • A. Since colonial times, 48 vertebrate species
    have become extinct in our nation.
  • B. 130 regarded rare and endangered by 1970

15
Fish and Wildlife Resources
  • 2. Assets
  • A. pleasure derived from wildlife
  • B. meat
  • C. insect destroying ability, valued at over one
    billion dollars per year.
  • D. hunting and fishing brings in more than one
    billion dollars each year.

16
Fish and Wildlife Resources
  • 3. Wildlife conservation programs
  • A. programs directed especially for hunters and
    fishermen.
  • B. satisfying the demands of the non-hunting and
    non-fishing public through the use of parks and
    game preserves.

17
Forest Resources
  • A. Acres of forest land
  • 1. In 1607 half our land was forested, over 1
    billion acres.
  • Almost 70 is still forest
  • 1/3 of todays forest land is noncommercial

18
Forest Resources
  • B. Production
  • 1. Since colonial times U.S. forests have
    produced about 2,700 billion board feet of
    timber.
  • 2. Each year our forests grow more wood than we
    harvest.

19
Forest Resources
  • C. Mature Forests
  • 1. Canopy is dominated by mature, slow-growing
    trees
  • a. produces very little wood

20
Other Resources
  • A. Energy Sources
  • 1. Most energy comes directly or indirectly from
    the sun
  • 2. Wind- used to move our goods and pull water
    form the earth.
  • A. Windmills
  • Sailing Ships

21
Other Resources
  • 3.Coal
  • A. Most widely distributed storehouse of the
    suns energy.
  • B. First discovered in America in 1673 in
    Illinois.

22
Coal
  • C. 35 billion tons have been produced in the US
    since mining began.
  • D. Estimate reserves of 2.5 trillion ton of US
    coal, but is a one time resource.

23
Other Resources
  • 4. Oil
  • A. In late 1950s projected that oil reserves
    would last 14 years.
  • B. Today we use more oil but have greater store
    of known oil- is a one time resource.

24
Oil
  • 5. Natural Gas
  • A. Clean, efficient
  • B. Proven reserves 260 trillion cubic feet.

25
Other Resources
  • B. Minerals
  • 1. Most widely used are the metals
  • a. Fe, Cu, Al, Mg, Pb, Zn, Sn, (Iron, Copper,
    Aluminum, Magnesium, Lead, and Tin)

26
Other Resources
  • C. Recreational Resources
  • 1. Forests, lakes, beaches, mountains, parks,
    game animals and fish
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