| http://www.w3.org/ns/prov#value | - ientists found that in addition to water, sulfur dioxide, carbon dioxide and other materials, the sands of Mars also contain reactive chemicals known as perchlorates.Nasa???s now-defunct Phoenix lander had found perchlorate in the planet???s northern polar region, but scientists did not know until Curiosity???s analysis that the chemical apparently is widespread.???They seem to accumulate on the s
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