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Does the sentence state a fact or an opinion? The Mariana Trench, the deepest part of Earth's oceans, was discovered by the HMS Challenger in 1875.

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teamBlackout

Yes that is correct, as that is when it was discovered using a weighted sound rope. It wasn't until 1960 that a submersible came down to explore the Mariana Trench.

UnknownBLT
This is a fact, because it is stating an accurate historical event.

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