Means wise and careful use of materials.
a.natural resource b.erosion c.conservation
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Explanation:
a. Natural resource
Natural resources are resources that exist without any actions of humankind. This includes all valued characteristics such as commercial and industrial use, aesthetic value, scientific interest and cultural value. On Earth, it includes sunlight, atmosphere, water, land along
b. Erosion
Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water.
c. Conservation
Conservation is the care and protection of these resources so that they can persist for future generations. ... Conservation seeks the sustainable use of nature by humans, for activities such as hunting, logging, or mining, while preservation means protecting nature from human use.