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unit 8 nat. resource

natural resource anything in nature that people can use
biofuel a fuel produced from biological material such as corn
corn, sugar cane, and wood three examples of biofuels
pollution any waste product or contamination that harms or dirties an environment or harms living things.
nonrenewable resource a resource that once used, CANNOT be replaced
hydroelectric energy energy produced by the mechanical energy of flowing water
geothermal energy a type of energy produced naturally beneath Earth's surface
air, sunlight, wind, water, plants, and animals examples of renewable resources
renewable resource a resource that CAN be replaced
conservation the process of preserving and protecting an ecosystem or resource
reduce, reuse, recycle the three R's or the three ways to conserve
intercropping planting two different crops in the same area to help fight off insects and disease
crop rotation planting a different crop every other year to help conserve the soil
hydroponics using sand, gravel, and water instead of soil to plant crops
contour plowing planting crops in the natural curves of the land to help prevent soil erosion



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