How We Use Land What you should know

How We Use Land What you should know? • How do humans use land as natural resources • How logging, farming, and mining affect the land • How can lands be logged, farmed, and mined sustainably

How We Use Land Vocabulary • Natural resources • Logging • Farming • Mining • Sustainable

Vocabulary Natural resources. Natural substances ( not man made or synthetic) that humans use such as land, water, air, and soil

Vocabulary Logging- cutting, and loading of trees or logs onto trucks

Vocabulary Farming - the practice of producing and managing food

Vocabulary Mining - removal of valuable materials from the earth Examples: coal metals gemstones sand salt gravel

Vocabulary Sustainable – using a resource without being completely used up or destroyed

How We Use Land Use Non Urban Logging Mining Farming

How We Use Land Logging accomplished by Clear cutting “deforestation” Removing all trees in an area without replacing them Selective cutting Mature trees removed and others left alone

How We Use Land Clear cutting Disadvantages 1. Increases erosion Advantages 1. Least expensive 2. Decreases beauty of forests 3. Destroys wildlife habitat http: //video. nationalgeographic. com/video/news/140827 -lemur-babies-vin

Selective cutting Disadvantages Advantages 1. More expensive 1. Preserves wildlife habitat 2. Requires more road 2. Humans cut only needed building; which can trees also increase erosion

How We Use Land Use Non Urban Logging Mining Farming

How We Use Land Chapters 8 and 9 Mining accomplished by Strip mining Bulldozers used to clear away topsoil to expose valuable minerals Open pit mining Dig large holes in ground and remove ore

Minerals removed by mining copperr silver graphite aluminum

Disadvantages of mining 1. Wildlife habitat is lost 2. Large scale erosion 3. Toxic substances are left behind seep into drinking water supplies • arsenic • mercury • lead • cyanide

Responsible Mining 1. Mine Reclamation Law restore mined land to condition it was before mining began 2. Recycle existing products containing copper, aluminum, and iron

How We Use the Land Use Non Urban Logging Mining Farming

Farming How humans negatively affect farmland Erosion Is caused by? Desertification is caused by? Salinization is caused by?

Farming How humans negatively affect farmland Erosion Is caused by? • Removal of topsoil during crop harvest • Clearing of land to build houses • Clearing of forests to produce lumber

Causes of erosion Removal of forests urbanization Harvesting crops

Farming How humans negatively affect farmland Desertification Is caused by? • Overuse of land • Several crops plants a year; soil does not rest • Trees cut down for fuel • More animals are put out to graze than land can support

Causes of Desertification

Farming How humans negatively affect farmland Salinization Is caused by? • Irrigation water contains more salt than rainwater • Irrigation water is evaporated by sun leaving salt in soil • Plants can not grow when soil becomes too salty

Causes of Salinization