पृथ्वी की सतह के पास स्थित खनिजों को केवल खोदकर निकालने के लिए निम्नलिखित में से किस खनन विधि का उपयोग किया जाता है?

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?