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26/05/2014 16:41WORDS
19/04/2014 18:01
BLADE: the thin flattish part of different tools, as of a, turbine.
BY-PRODUCTS: something produced in a usually industrial or biological process in addition to the principal product
COAL: A natural dark brown to black graphite like material used as a fuel, formed from...
WIND ENERGY
19/04/2014 17:58
Today, wind energy is mainly used to generate electricity and the amount of electricity generated from wind has grown significantly in recent years.
Like old fashioned windmills, today’s wind machines (also called wind turbines) use blades to collect the wind’s kinetic energy. The wind flows...
GEOTHERMAL ENERGY
19/04/2014 17:49
"Geo" means "from the earth," and "thermal" means "heat," so this type of energy is found under the earth. The hot lava from a volcano and the hot steam from a geyser both come from underground heat and we can use that same type of heat in our homes.
A geothermal heater is very energy-efficient...
COAL ENERGY
19/04/2014 17:41
Coal is a black combustible sedimentary rock composed of carbon and hydrocarbons.
Coal is a nonrenewable energy source because it takes millions of years to create. The energy in coal comes from the energy stored by plants that lived hundreds of millions of years ago, when the Earth was partly...
SOLAR ENERGY
19/04/2014 17:32
The sun has produced energy for billions of years. Solar energy is the sun’s rays (solar radiation) that reach the Earth. This energy can be converted into other forms of energy, such as heat and electricity.
When converted to thermal (or heat) energy, solar energy...
NATURAL GAS
19/04/2014 17:30
The creation of natural gas
Millions of years ago, the remains of plants and animals decomposed and built up in thick layers. This decomposed matter from plants and animals is called organic material (it was once alive). Over time, the mud and soil changed to rock, covered the...
PETROLEUM
19/04/2014 17:20
The creation of petroleum
Millions of years ago, the remains of plants and animals decomposed and built up in thick layers. This decomposed matter from plants and animals is called organic material (it was once alive). Over time, the mud and soil changed to rock, covered the organic...
NUCLEAR ENERGY
19/04/2014 17:10
Nuclear power is produced when the atoms that make up enriched uranium are split. Uranium is mined from the ground, just like coal or copper or silver ore. The uranium is then formed into pellets that are put in tubes inside a nuclear reactor.
Fission also creates radiation, which in...
HYDROELECTRIC ENERGY
19/04/2014 17:01
Hydro comes from the Greek word for water, so Hydroelectric power, or hydroelectricity, is generated by the force of falling water. It is one of the cleanest sources of energy, and it is also the most reliable, as it costs the least. That means that hydroelectric power...
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