पेरू के तट पर ठंडी पेरूवियन जलधारा के अस्थायी प्रतिस्थापन के रूप में एक गर्म समुद्री जलधारा के आवधिक विकास को किस नाम से जाना जाता 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?