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Vocabulary Review for Chapter 10--Using Natural Resources

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A	B
Solar energy	the energy transformed from sunlight
Humus	a dark brown part of soil that is made up of decomposed plants and animals
Solar cells	electric cells that convert the Sun's energy into electricity
Ore	a mineral-rich rock deposit that can be removed from Earth's crust and used to make products
fossil fuels	fuels including coal
petroleum	a crude oil that is found in rocks
conservation	using only what you need as efficiently as possible
recycling	saving, collecting, or using materials again instead of turning them into waste