Earth scientists in China have found evidence of a subduction zone dating to 2.5 billion years ago.
At subduction zones, where one plate bends deep beneath another, the sinking plate can carry more than an ocean's worth of water into the mantle over billions of years.
A new subduction zone south of New Zealand formed when tectonic forces brought a segment of weakened continental crust from the submerged continent of Zealandia next to denser oceanic crust.
A subduction zone is a collision between two of Earth's tectonic plates, where one plate sinks into the mantle underneath the other plate.
There are about 1,350 potentially active volcanoes on Earth. Where are most of these volcanoes located?
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