Simple past tense and past participle of explore.(verb)
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Use "explored" in a sentence
"I say to them that claiming the Moon has already been explored is like saying that after landing at six U.S. airports, you then drive around the runways in a baggage cart, then declare "I've seen America!""
"The question explored is what will happen on our planet if population growth, resource depletion and climate change continue unabated."
"But what we haven't recently explored is how meaningless most messages are compared to a human life."