Page 112 - Key to Social Studies 4
P. 112
Let’s Observe
Renewable Resources
Hydroelectric power
Water ows and streams are used to move
turbines that generate electricity.
Hydroelectric power has made it easier and
cheaper for a lot of industries and factories to
manufacture their products.
Hydroelectric power is estimated to give
about 20% of the world’s energy
requirements. China is the biggest producer
of hydroelectric power in the world.
Englebright Dam on the Yuba River,
Nonrenewable Resources
Nevada, USA
Burning coal
Coal is one of the main natural resources
needed for power. It is extracted and burnt to
produce carbon to be used for energy.
Coal takes thousands of years to be
extractable, which makes it a nonrenewable
source of energy because its extraction
cannot keep up with its consumption.
China is also the largest coal-dependent
country in the world as it uses coal for
approximately 70% of its whole power needs.
Coals burning
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