Given the right pressure, carbon atoms in the melting rocks bond together to form diamond crystals.
The surface of the earth is molten rock.
University of Alaska geophysicists note a region where sound waves travel more slowly than normal, a characteristic of partly molten rock.
There, in the Earth's upper mantle, temperatures are high enough to melt rock and form magma.
Not only is there apparently a small molten core, but a large layer of partly melted rock around it.
Each explosion consumed between 1 and 30 percent of the device's fissile material, leaving the remaining fuel mixed with debris and melted rock underground, according to the study.
These vents form above cracks in volcanic areas of the ocean floor through which seawater seeps, there to be heated by hot, sometimes molten rock.
On the 10th and 11th it sent molten rock more than 40 kilometres into the sky in the most powerful eruption of the past 500 years.
Ever since Apollo days, scientists have suspected that Earth's closest neighbor may harbor a core or zone of melted rock.
They are places where the plates are moving apart and molten rock is welling up from below the surface to fill the gap a phenomenon known as sea-floor spreading.
Tell people that nuclear waste will be buried in concentrations hot enough to melt rock, he says, and some will worry that it might explode like a volcano.Some say the stuff should not be permanently buried at all.
