Satellites reveal melting of rocks under volcanic zone, deep in Earth's mantle: Volcanoes erupt when magma rises through cracks in the Earth's crust, but the exact processes that lead to the melting of rocks in the Earth's mantle below are difficult to study.
Chemistry says Moon is proto-Earth's mantle, relocated. Measurements of an element in Earth and Moon rocks have just disproved the leading hypotheses for the origin of the Moon. Read more at: http://phys.org/news/2016-09-chemistry-moon-proto-earth-mantle-relocated.html#jCp
We may have another "ocean" to add to the world map -- only this one is hidden hundreds of miles beneath our planet's surface. A new study suggests that a hidden "ocean" is nestled in the Earth's mantle some 400 miles beneath North America. The hidden reservoir, apparently locked in a blue crystalline mineral called ringwoodite, may hold three times as much water that exists in all the world's surface oceans.
Scientists want to be first to drill into the Earth's mantle - CNN.com