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Revision, , > Scientific terms :, , 1.Soil — the uppermost layer of the earth in which plants, grow., , 2.Deforestation -— cutting down of trees in large, numbers., , 3. Afforestation — planting of trees in large numbers., , 4.Soil conservation — prevention of soil erosion., , 5.Communicable diseases — diseases that can spread, from one person to another., , 6.Non-communicable diseases — diseases that cannot, spread from one person to another., , 7.Balanced diet — a diet that contains all nutrients in the, right amount., , 8.Reflex action — an automatic response of the body, , which is under the control of the spinal cord.