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Conserving Land and Soil. Conserving Land and Soil. Less than a 1/4 of Earth's surface is dry land. Except for the small amount added when volcanoes erupt, new land cannot be created. All the people on Earth must share this limited amount of land to… Produce their food Build shelter

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conserving land and soil2
Conserving Land and Soil
  • Less than a 1/4 of Earth's surface is dry land.
  • Except for the small amount added when volcanoes erupt, new land cannot be created.
  • All the people on Earth must share this limited amount of land to…
    • Produce their food
    • Build shelter
    • Obtain other resources
    • Land is a precious resource!
types of land use
Types of Land Use
  • People use land in many ways.
  • Three uses that change the land are agriculture, development, and mining.
  • There are many other types of land use
agriculture
Agriculture
  • Since land is the source of most food, agriculture is an important land use.
  • New farmland must be created by clearing forests, draining wetlands, and irrigating deserts.
development
Development
  • A type of land use that changes the land even more than agriculture is development.
  • Development is the construction of homes, stores, office buildings, roads, bridges, and other structures.
  • The process continues as what?...
  • Population grows.
  • Development not only reduces the amount of farmland, but can also destroy wildlife habitats.
mining
Mining
  • Mining changes the land as mineral resources such as iron, copper, and coal are removed.
  • Once land has been mined, it is often difficult to use the land for another purpose.
the value of soil
The Value of Soil
  • Soil is one of Earth's most valuable resources because everything that lives on land depends directly or indirectly on soil.
  • It can take hundreds of years for just a few centimeters of soil to form.
  • The thick, fertile soil may take thousands of years to develop.
  • Fertile soil is valuable because there is a limited supply.
  • Less than one eighth of the land on Earth has soils that are well suited for farming.
soil damage and loss
Soil Damage and Loss
  • Soil is one of Earth's most important resources.
  • But soil can be lost or damaged.
    • It can become exhausted.
    • Lose its fertility
    • Polluted by human activities such as mining or chemical spills.
    • It can be lost to erosion by water and wind.
soil conservation
Soil Conservation
  • Soil conservation is the management of soil to prevent its destruction.
  • Ways that soil can be conserved include
    • Contour plowing
    • Conservation plowing
    • Leaving the soil to lie fallow
    • Crop rotation