जब मध्य और पूर्वी भूमध्यरेखीय प्रशांत महासागर में समुद्र की सतह का तापमान औसत से काफी ठंडा हो जाता है, तो यह किस घटना को जन्म देता है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?