<span>The softer a rock's composition is the slower it will weather, the harder a rock's composition the faster it will weather. Weathering weakens and breaks apart rocks. This is an example of how weathering affects the Earth's surface. No-Till Farming and Contour Farming are two examples of preventing soil erosion.</span>
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Answer:
A drug is a substance, which alters The functioning of mind and body of a person. Drug can cure disease when taken in right quantities under the supervision of a physician.
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An Element
Explanation:
Such substance cannot be an element because an element cannot be chemically disintegrated (i.e it cannot be disintegrated via chemical reaction).
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Explanation:
in some reactions we see this as a change in the temperature. ... The study of energy changes (particularly heat) in chemical reactions is known as ... When a chemical reaction occurs, bonds in the reactants break, while new bonds form in the product. ... Physical changes can also be classified as exothermic or endothermic.
