degrade - (v) lower in quality, erosion - (n) condition in which earth's surface is worn away by the action of water and wind, sewage - (n) waste matter from home, carried away in a system of pipes, aquatic - (a) of water or living in water, awareness - (n) knowledge of something, reforestation - (n) the act of planting trees on an area of land that has become empty or spoiled #deforestation, preserve - (v) to keep something as it is, especially in order to prevent it from decaying or being damaged or destroyed,

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