UNIT11

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• exhaust

• source

• enormous

• cause

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• sun

• solar

• safe

• sure

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• heat

• great

• release

• reach

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• geothermal

• power

• solar

• hydro

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• polluted

• consume

• nuclear

• fuel

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#1

• energy

• exhausted

• natural

• plentiful

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• electricity

• geothermal

• alternative

• radiation

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• available

• potential

• unlimited

• infinite

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• release

• supplies

• nuclear

• convenient

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• ecologist

• fertilizer

• dangerous

• scientist