F58fbnatural resources 2 (1)
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Energy left over from the original formation of the planet along with heat from radioactive decay slowly escapes from within the Earth every day. In some areas where the increase in temperature with depth is high enough, this geothermal energy can be used to generate electricity, but is limited to only a few locations worldwide and faces technical challenges. Another form of geothermal energy is using the Earth's relatively constant subsurface temperature via heat pumps for heating and cooling buildings, which can reduce other energy needs for temperature regulation but cannot produce electricity.
F58fbnatural resources 2 (1)
- 1. Energy left over from the original accretion of the planet and augm ented by heat from rad ioactive d ecay seeps out slowly everywhere, everyd ay. In certain areas the geotherm al grad ient (increase in tem perature with d epth) is high enough to exploit to generate electricity. This possibility is lim ited to a few locations on Earth and m any technical problem s exist that lim it its utility. Another form of geotherm al energy is Earth energy, a result of the heat storage in the Earth's surface. Soil everywhere tend s to stay at a relatively constant tem perature, the yearly average, and can be used with heat pum ps to heat a build ing in winter and cool a build ing in sum m er. This form of energy can lessen the need for other power to m aintain com fortable tem peratures in build ings, but cannot be used to prod uce electricity.
- 2. WIND Energy from the wind. Why is energy from the wind renewable?
- 3. The m ovem ent of the atm osphere is d riven by d ifferences of tem perature at the Earth's surface d ue to varying tem peratures of the Earth's surface when lit by sunlight. Wind energy can be used to pum p water or generate electricity, but requires extensive areal coverage to prod uce significant am ounts of energy.
- 4. BIOMASS Energy from burning organic or living matter. Why is energy from biomass renewable?
- 5. BIOMA SS the term for energy from plants. Energy is in this form is very com m only used throughout the world . U nfortunately the m ost popular is the burning of trees for cooking and warm th. This process releases copious am ounts of carbon d ioxid e gases into the atm osphere and is a m ajor contributor to unhealthy air in m any areas. Som e of the m ore m od ern form s of biom ass energy are m ethane generation and prod uction of alcohol for autom obile fuel and fueling electric power plants.
- 6. WATER or HYDROELECTRIC Energy from the flow of water. Why is energy of flowing water renewable?
- 7. L ike the wind s, flowing water is a prod uct of the earth ´s clim ate and geography. Snowm elt and runoff from precipitation at higher elevations flow toward sea level in stream s and rivers. In an earlier era, water wheels used the power of flowing water to turn grind ing stones and to run m echanical equipm ent. M od ern hyd ro-turbines use water power to generate hyd roelectricity.
- 8. SUMMARY What are the differences between nonrenewable and renewable resources?
- 9. Renewable resources are those that are replaced in nature at a rate close to their rate of use. Non renewable resources exist in fixed amounts or are used up faster than they can be replaced in nature.
- 10. THANK YOU