সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন 
The center of the earth is known as the--
The center of the earth is known as the--
- ক. hydrosphere
- খ. core
- গ. crust
- ঘ. atmosphere
সঠিক উত্তরঃ core
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Basic Information of Daily Science, Inventions and...