"Product of volcanic activity" NYT crossword answer is:BASALT (6 letters length)
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The product of volcanic activity crossword clue in the New York Times (December 27 2023) is "LAVA". Lava is molten rock that is expelled from a volcano during an eruption. It is usually composed of a combination of minerals and gases, and can reach temperatures of up to 1,200 degrees Celsius. Lava can be very destructive, but it can also be beneficial, as it can create new land and provide nutrients to the soil.