Unsolved mysteries of our planet

12. Hidden ocean
At a depth of 410-660 km below the Earth’s surface scientists have detected a huge water reservoir age of 2.7 billion years. This fluid found due to breed ringwoodite, which consists of the mantle. The water is under enormous pressure, and it is enough to 3 times to fill all the oceans of the Earth. Due to this discovery, a theory that earth’s oceans came from break out of the underground ocean.