Earth= Edre. Unless you are saying it as in "I live on earth"= Ich lebe der Edre. Or "We live on earth"= Wir leben auf der Welt. All nouns in German are capitalized. You don't need to say "auf" most Germans don't... Do you have options to the question? OR do you know if its He or She or they? Because German possessives nouns are masculine and feminine and kinder(children).
Richterin
I think
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Deutsch is mandatory, and so is Mathematic (Mathe for short).
A Wissenschaft (science), such as Physic, Biologie, or Chemie, is also mandatory.
At a Gymnasium, at least two foreign languages are required to graduate - Spanisch, Latein, Französisch.
Electives are subjects such as Kunst, Musik, and Informatik.
Hope this helps!