MCQ Practice General knowledge 📖 The most abundant element in the earth 's crust is oxygen . The second most abundant element is the earth's crust is - ক Hydrogenখ Nitrogenগ Siliconঘ Favorite Practice Add to Book Explanation & Answer Detailed explanations and answers are restricted. Unlock full access by logging in to your account. 🔒 Unlock the detailed explanation and answers Log In / Sign Up This question appeared in JBL RBL Officer Question Bank 2019 Question 4 PreviousHow many people have been awarded 'The Bir Uttam ' for their bravery dedication in the Liberation War of Bangladesh ... NextThe branch o economics with overall performance of the economy is known a -
