F58fbnatural resources 2
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    F58fbnatural resources 2 F58fbnatural resources 2 Presentation Transcript

    • Energy left over from the original accretion of the planet andaugm ented by heat from rad ioactive d ecay seeps out slowlyeverywhere, everyd ay. In certain areas the geotherm al grad ient(increase in tem perature with d epth) is high enough to exploit togenerate electricity. This possibility is lim ited to a few locations onEarth and m any technical problem s exist that lim it its utility. Anotherform of geotherm al energy is Earth energy, a result of the heat storagein the Earths surface. Soil everywhere tend s to stay at a relativelyconstant tem perature, the yearly average, and can be used with heatpum ps to heat a build ing in winter and cool a build ing in sum m er. Thisform of energy can lessen the need for other power to m aintaincom fortable tem peratures in build ings, but cannot be used to prod uceelectricity.
    • WIND Energy from the wind. Why is energy from the wind renewable?
    •  The m ovem ent of the atm osphere isd riven by d ifferences of tem perature at theEarths surface d ue to varyingtem peratures of the Earths surface whenlit by sunlight. Wind energy can be used topum p water or generate electricity, butrequires extensive areal coverage toprod uce significant am ounts of energy.
    • BIOMASS Energy fromburning organicor living matter. Why is energy from biomass renewable?
    • BIOMA SS   the term for energy from plants. Energy isin this form is very com m only used throughout theworld . U nfortunately the m ost popular is the burningof trees for cooking and warm th. This process releasescopious am ounts of carbon d ioxid e gases into theatm osphere and is a m ajor contributor to unhealthy airin m any areas. Som e of the m ore m od ern form s ofbiom ass energy are m ethane generation andprod uction of alcohol for autom obile fuel and fuelingelectric power plants.
    • WATER or HYDROELECTRIC Energy from the flow of water. Why is energy of flowing water renewable?
    • L ike the wind s, flowing water is a prod uct of theearth ´s clim ate and geography. Snowm elt andrunoff from precipitation at higher elevationsflow toward sea level in stream s and rivers. Inan earlier era, water wheels used the power offlowing water to turn grind ing stones and to runm echanical equipm ent. M od ern hyd ro-turbinesuse water power to generate hyd roelectricity.
    • SUMMARY What are the differences betweennonrenewable and renewable resources?
    • Renewable resources are those that arereplaced in nature at a rate close to their rateof use. Non renewable resources exist infixed amounts or are used up faster thanthey can be replaced in nature.