Things are heating up hundreds of miles off the coast of Oregon, where a large undersea volcano is showing signs of impending eruption, scientists say.The volcano, known as Axial Seamount, is located nearly 1 mile (1.4 kilometres) underwater on a geological hot spot, where searing gushes of molten rock rise from Earth's mantle and into the crust.Hotspot volcanoes are common on the seafloor.
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