7th+Period+Group+4

WIND ENERGY


 * Wind turbinesturn in the moving air and power an **electric generator** that supplies an electric current
 * Wind turbines are available in a variety of sizes, and therefore power ratings
 * [[image:http://www.isa.org/Images/InTech/2006/September/2006wind1.jpg]][|http://en.wikipedia.org/wiki/Floating_wind_turbine]
 * A floating wind turbine is an offshore wind turbine mounted on a floating structure that allows the turbine to generate electricity in water depths
 * The winds are stronger over the ocean then one land
 * The electricity generated is sent to shore through undersea cables
 * The electricity generated is sent to shore through undersea cables

On The Good Side
 * They are thus a better choice than conventional power plants that use non-renewable sources, emit air-pollutants and greenhouse gases.

=﻿ ACID RAIN =

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﻿ACID RAIN DAMAGE


 * **In sea life,acid rain is very harmful in the environment.Acid rain causes the water to be polluted and makes the fish die.**



> When humans burn fossil fuels, sulfur dioxide and nitrogen oxides are released into space. These chemical gases react with water, oxygen, and other substances to form mild solutions of sulfuric and nitric acid. Winds may spread these acidic solutions across space and over hundreds of miles. When acid rain reaches Earth, it flows across the surface in runoff water, enters water systems, and sinks into the ground. > Acid rain has many effects, but none is greater than its impact on lakes, streams, ponds, and other aqua environments. Acid rain makes waters acidic and causes them to absorb the aluminum that makes its way from soil into lakes and streams. This combination makes waters toxic to crayfish, clams, fish, and other aquatic animals. > Acid rain also damages forests, especially those at higher elevations. It robs the soil of essential nutrients and releases aluminum in the soil, which makes it hard for trees to take up water. Trees' leaves and needles are also harmed by acids. > The effects of acid rain, combined with other environmental stressors, leave trees and plants less able to withhold\ > cold temperatures, insects, and disease. The pollutants may also inhibit trees' ability to reproduce. Some soils are better able to neutralize acids than others. In areas where the soil's "buffering capacity" is low, the harmful effects of acid rain are much greater. > The only way to fight acid rain is by curbing the release of the pollutants that cause it. This means burning fewer fossil fuels. Many governments have tried to curb emissions by cleaning up industry smokestacks and promoting alternative fuel sources. These efforts have met with mixed results. But even if acid rain could be stopped today, it would still take many years for its harmful effects to disappear. > Individuals can also help prevent acid rain by conserving energy. The less electricity people use in their homes, the fewer chemicals power plants will emit. Vehicles are also major fossil fuel users, so drivers can reduce emissions by using public transportation, carpooling, biking, or simply walking wherever possible.
 * In land, acid rain affects the growth of crops. Acid rain describes any form of precipitation with high levels of nitric and sulfuric acids. It can also occur in the form of snow, fog, and tiny bits of dry material that settle to Earth.

How wind power works

__Where does Acid Rain occur﻿ __  
 * Acid rain occurs in [|China] caused by rapid industrial growth**.**
 * ﻿Acid rain also occurs in [|Europe]
 * ** ﻿ **