write one word for the following statements (a) the type of friction less than sliding friction (b) the gas whose composition is CO+H2. (c) paper suitable for recycling (d) a scale used to measure the intensity strength of an earth quake in terms of the amplitude of its seismic waves.
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d)Richter scale is used to measure the intensity of an earthquake.
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(a) rolling friction
(b) water gas
(c)scrap paper
(d) Richter scale
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