What ALWAYS happens at the autumnal equinox?
Day and night are of equal length.
The sun shine...
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Which is the solubility product expression for caf2(s)?  [ca2+]/[f–]2  [ca2+][f2–]  [ca]+[f]2  [ca2+][f–]2
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Explain how to convert from one unit to another in the metric system.
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What are two radioactive isotopes that are used for dating rocks that are older than 10 million years
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