निम्नलिखित में से कौन-सी भू-आकृति हवा के निक्षेपण द्वारा बनती है, न कि समुद्री तरंगों के अपरदन या निक्षेपण कार्य द्वारा?

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?