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Fusion. Apex
No, normally it occurs at temperatures of millions of degrees. It does occur at room temperature, but not in significant amount; any possible practical use of "cold fusion" is, so far, speculation.
Convection occurs when and where a fluid is in a gravity field and heat is applied to its base.
Yes, that is where we get the nuclear material for our reactors, by mining it from the Earth. Though it does not occur in high concentrations, we have to concentrate it ourselves.
The temperature has little to do with it.
Not nuclear, it takes an extremely hight temperature for Fusion to occur with in the sun or any other star. ADDED: Yes "nuclear". Fusion is one of the two type of nuclear reaction, the other being Fission.
Because the conditions of temperature and pressure that occur in stars do not occur on earth
For nuclear fusion.
The dangerous condition that can occur in a nuclear reactor and due to overheating is a nuclear meltdown.
In areas of high temperature and high pressure
Fusion. Apex
fusion
No, normally it occurs at temperatures of millions of degrees. It does occur at room temperature, but not in significant amount; any possible practical use of "cold fusion" is, so far, speculation.
It is spontaneous, or it occurs on its own without any outside input. It may occur extremely slow or extremely fast, but it will occur without any outside input at the specified temperature.
Deformation occurs
The corresponding white dwarf needs to reach a temperature for nuclear fusion to occur, which is about 20 million degrees kelvin.
There are many ways a nuclear accident may occur, however most nuclear power plant accident occur due to problem in an reactor.