About how many years ago did the ocean form on earth?
A4500 Million year
B4000 Million year
C5000 Million year
D5500 Million year
A4500 Million year
B4000 Million year
C5000 Million year
D5500 Million year
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രേഖാംശവുമായി ബന്ധപ്പെട്ട് ശരിയാ യതേത് ?