The given illustration presents information on the process of the usage of 
uranium
 in nuclear energy generation. 
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Overall
, as can be seen, it is a man-made 6-step production, which starts with the Linking Words
uranium
 extraction and ends with the burial of radioactive waste.
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The first step is
 to mine Linking Words
uranium
 from the ground. The second action is conversion and enrichment: Use synonyms
uranium
's quality is being improved to make little pieces of fuel called U-235. Use synonyms
Next, 
these pellets are used to produce nuclear electricity at the power plant.
After around four years the U-235 energy cannot be used again and step 4 begins, which is disposal. Linking Words
However
, some of that fuel can be recycled and utilized again to generate electric power, so the third stage can be repeated again. The final phase is to store the needless radioactive energy from the Linking Words
uranium
 in special tanks and bury them  because it is not possible to reuse the fuel.Use synonyms