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The document on NCERT Science Class 9 — Chapter Atoms and Molecules explains the basic building blocks of matter. It describes what atoms and molecules are, how elements combine to form compounds, and the laws of chemical combination. The chapter introduces Dalton’s atomic theory, chemical formulas, valency, and the mole concept used for calculating masses of substances in chemical reactions. It helps students understand how matter is structured and how chemical calculations are performed in...

This PDF contains well-organized and easy-to-understand notes on the Drainage chapter for Class 9 Geography. It is perfect for quick revision, exam preparation, and concept clarity.