Chemistry
Beryllium, magnesium, calcium, strontium, barium, and radium consist what group of elements?
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What allotrope of oxygen helps protect the biosphere from solar ultraviolet radiation?
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A unit of measure of absorbed radiation is known as what?
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What gas in excited state is responsible for the bright red and yellow-green colors of the aurora?
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What is the breakdown of a material by separation of the layers of which it is composed called?
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What two solvents could be used in a successful extraction?
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