Question: Both written by George Harrison "Bangla Desh" and "Deep Blue" were songs intended to raise awareness for what?
Sentence (from "Azurite"): The mineral, a carbonate, has been known since ancient times, and was mentioned in Pliny the Elder's Natural History under the Greek name "kuanos" (κυανός: "deep blue," root of English "cyan") and the Latin name "caeruleum".
Relevant evidence: No