the process by which Earth makes heat is called radioactive decay. it involves the disintegration of natural radioactive elements inside Earth. ex; uranium is a special kind of element because when it decays, heat is produced from it
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The event of Brexit was when Britain decided to exit from the rest of the European countries. Considering the immigration policy of the Brexit, it decided that it will have the same immigration policy for the European countries like it has for the rest of the countries of the world.
It also decided to cut the number of people entering Britain because it wanted to give more employment opportunities to it's own citizens and reduce other races coming.
The amount of trees in a given location?