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Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.
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Which of the following electromagnetic waves can create ions?
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Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?
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A22.4-l sample of which of the following substance, at stp, would contain 6.02 x 10^23 representativ...
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