GLY120 1 - Lecture 1 Earth Resources Natural resources are...

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Lecture 1 – Earth Resources Natural resources are naturally occurring concentrations of mineral substances which can be economically extracted . There are two types – 1.Renewable (Earth materials that can be replenished over a short time (few months or years); organic materials derived from plants and animals, as well as energy from wind, flowing water, and the Sun’s heat.) 2.Non-renewable (Materials which are contained in the Earth in a fixed quantity; they are replenished by natural processes operating on a short time scale.) [Oil, Natural Gas, Coal, etc.] The main difference between renewable and non-renewable resources is the time it takes for a resource to be replenished by natural processes. Many natural resources should be considered renewable, but human mismanagement and environmental pollution (caused by humans), however, has/can cause them to become non-renewable.. a. Plants and Animals (overeating, causing extinction; deforestation..) b. Fresh Water (overuse [2% fresh water, most of which is locked into glaciers and ice caps; 97% salt water, no technology to use].. ) c. Trees (deforestation..)
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