Because uranium is "burned" in nuclear reactors.
Yes
Years after years uranium also will run out of the earth.
Uranium was created in the early stages of the universe by stellar nucleosynthesis. Uranium cannot be lost from the earth.
The common estimate is that there is 50 times the energy reserves in Uranium as in fossil fuels. A common estimate is that we could run out of fossil fuels in 40 years. Therefore one can predict running out of Uranium in 50 * 40 years, or 2000 years.However this is assuming use of only reactors operating on thermal neutrons, which can burn only the uranium-235 isotope. But this is only 0.72% of natural Uranium. Use of fast breeder reactors which can make and burn Plutonium from the uranium-238 making up the other 99.28%, the reserves can be extended by about a factor of 100. In this case the Uranium will not run out for 200,000 years!
Yes, a critical mass of uranium typically requires enriched uranium. Enriched uranium has a higher concentration of the fissile isotope uranium-235, which is necessary for sustaining a nuclear chain reaction in a reactor or weapon. Unenriched uranium, which is mostly uranium-238, requires a larger critical mass to achieve a sustained chain reaction.
no because we will run out of uranium someday and we don't have a way to make more
There is so much uranium in the Earth's crust and mantle that it is unlikely that we will run out.
Uranium is not made on the earth. Uranium and the majority of the other elements (excepting H, He, Be, Li, transuranium elements) are formed after the big-bang (creation of the universe) by stellar nucleosynthesis.
Because only the isotope 235U is fissionable with thermal neutrons and also is good for nuclear weapons. This is because normal uranium in the Earth is 0.7 % 235U and 99.3 % 238U. The 235U needs to be enriched to 4 % or greater in order to be effective as a fissile material (fission with neutrons producing fission and more neutrons that can continue the reaction) reaction. Power plants run around 4 % to 5 %; but CANDU type reactors work with natural uranium. Weapons run +99 %. Small high capacity reactors, such as on a submarine, run around 20 %.
No and no. Uranium was formed before the Earth formed. Even the uranium that's IN the Earth was formed before the Earth was formed, by the process of stellar nucleosynthesis. Also, the most stable isotopes of uranium do have very long half-lives, but they are still radioactive, meaning that they eventually will decay into other materials.
Either yellow uranium oxide (yellowcake) or metallic uranium in most reactors. In moderated thermal neutron reactors the uranium is usually enriched to 3% to 5% uranium-235 isotope, in unmoderated fast neutron reactors the uranium is enriched to 20% to 95% uranium-235 isotope. This uranium comes from mines (similar to coal or iron ore mines). What is mined is usually black uranium oxide ore. This ore is processed to make unenriched yellowcake (0.7% uranium-235) and shipped to the enrichment plant. Most enrichment plants process the yellowcake to make uranium hexafloride then run that through their system, producing both enriched uranium (product) and depleted uranium (waste). The enriched uranium hexafloride is then processed back to yellowcake and shipped to a finishing plant that uses it to make the required fuel assemblies.
No, uranium ore is primarily used for nuclear power generation by extracting uranium for use in reactors. Geothermal power is produced by harnessing the heat from the Earth's core, typically through the use of steam to drive turbines and generate electricity.