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Unit 5: Earth and Space, Part 2
Lesson 3: Alternative Energy Resources
Solar Energy
Y ou have already learned that the Sun is the major source of
energy for Earth. The Sun provides enough energy in 1 minute
to supply the world with energy for 1 year.
Energy from the Sun is called solar energy. Solar energy can
be collected on solar panels. The collected solar energy is then
changed into usable electrical energy.
solar panels
Geothermal Energy
Geothermal energy is heat energy found beneath Earth’s
crust. It collects in areas called reservoirs. Wells are drilled
into geothermal reservoirs beneath Earth’s surface. The hot
water and steam from the reservoir go up through the wells to
Earth’s surface. The hot water and steam spin the turbines in a
geothermal power plant. Electricity is produced.
Geothermal energy is an alternative energy resource.
