Yes, all natural radiation (in the rocks) is a result of fission (but this fission is not part of a chain reaction like in a fission bomb).
However, it is theoretically possible for natural processes to concentrate radioactive elements (uranium) to the extent where a natural nuclear fission reactor (a chain reaction like in a nuclear power plant) will form. Oklo in in Gabon is the only known location for this to have happened and consists of 16 sites at which self-sustaining nuclear fission reactions took place approximately 1.7 billion years ago.
The earth will get warmer.
In Kobe, Japan.
earthquakes happen when these sections of earths crust move
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September 3 2010
Nuclear reactor
Fission in Uranium would take billions of years when its left to its own devices. Because of radioactive decay, it would either release alpha or beta radiation, or fission. The earth would have to be really old for that to maybe happen. Besides, Only less than 1% of Uranium is U-235, which is the only isotope of uranium that would fission, is found on earth.
Fusion only, there are no heavy elements like uranium so there can be no fission taking place
Both can be created on earth, and both have been. Fission has been used in atomic bombs, and fusion has been used in hydrogen bombs.
Nuclear fission, the fission or "splitting" of an atomic nucleus, can happen in two basic ways. One is a form of natural radioactive decay called spontaneous fission. The atom just "splits" apart. The other involves the absorption of a neutron, and fission can occur as a result of this as well. Both spontaneous fission and neutron absorption are described in separate questions here on WikiAnswers. You'll find links to them below.
Fission
Fission and fussion manly occar in a star or a sun. The reason that a star or a sun is bright is because of the heat that is given off of from fission and fussion.
The moon is a solid rock that reflects the sun's light back to Earth. It does not under go wither fission or fusion.
it will create nuclear fission that is highly potent
Nuclear fission
The nucleus splits into two parts, which are called the fission products. Free neutrons are also released, and some gamma radiation.
There is evidence that it did occur on earth some two billion years ago, in a few places with high levels of uranium present. As far as the rest of the Universe, we just don't know.