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
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.
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.
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.
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.
The nucleus splits into two parts, which are called the fission products. Free neutrons are also released, and some gamma radiation.
From the sun to the moon to the earth.
Nuclear fission has been used in nuclear bombs and is currently being used in every nuclear power plant on the earth.
The neutrons produced by fission in a nuclear fission reactor during the process of thermalization to be available for a new generation of fission could be subject to:absorption in fuelabsorption in non fuel reactor components (moderator, clad, structural material, ...)fast leakageresonance capture in U-238fast fission in U-238thermal leakage
The fission theory is a scientific explanation for the formation of the Moon. It suggests that the Moon was once part of the Earth and broke off due to a massive impact with another celestial body, leading to its formation. This theory is supported by evidence such as the similarities in composition between the Earth and Moon.