• In most cases, reserves contain minerals exceptionally concentrated in one place well above what scientists and geologists call "crustal abundance, " the frequency of the mineral in the specified rock.

    WSJ: Exhausting the Earth's Resources? Not So Fast

  • Our mission, as it's planned, is to fly over some of the oldest terrain on Mars, very highly magnetized crustal material that dates back to the beginning of Mars, 4.6 billion years ago.

    NPR: Revisiting the Viking Missions to Mars

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