helium-3 comes almost entirely from the initial cloud of dust and gas that formed the solar system. This primordial element was already known to exist inside Earth. Each year, about 4.4 pounds (2 ...

They call this tectonic plate boundary zone the East African Rift Valley (EAR), part of the wider East African Rift System ... a new narrow ocean basin with its own mid-ocean ridge between ...

The process renews the ocean floor and widens the giant basins. A single mid-ocean ridge system connects the world's oceans, making the ridge the longest mountain range in the world. On land ...

The now fully-developed mid ocean ridge is the site of hot new ocean floor ... If a passive margin is near a large river system, the sedimentary rocks deposited there will be detrital: sandstones and ...

Every other solar system planet was named for a Greek or ... These bodies of water contain 97 percent of Earth's volcanoes and the mid-ocean ridge, a massive mountain range more than 40,000 ...

Primordial helium from the beginning of the solar system may be stuck inside ... of helium-3 leaks out of mid-ocean ridges where the crust is pulling apart and out of volcanic hotspots that ...