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Solar Energy
Sunlight gives us light during the day, warms us up and provides plants with the energy they need to grow.
It was solar energy many millions of years ago that helped the plants
to grow that were later converted into fossil fuels.
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Solar energy creates wind, waves and ocean currents.
It also evaporates water from seas and lakes. In time the water vapour
condenses to form clouds and then falls as rain and snow. |
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Using
technology, the energy of sunlight can be used to warm buildings (known
as passive solar heating) heat water (solar hot water) and make
electricity (photovoltaic or PV cells).
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Geothermal Energy
In some places the molten core at the centre of the Earth is close to the surface (a few kilometres down).
If it breaks through the surface there is a volcanic eruption.
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If the molten magma just comes close to the surface, it heats the solid rock.
If these hot rocks contain water, then this is heated and appears at
the surface as hot springs and gushing steaming geysers from where
energy can be collected. |
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