make a paragraph using the questions below: 1. Why is the river polluted? 2. What materials made the river polluted? 3. Classify the materials according to their characteristics (sink, float, absorb water, do not absorb water and decay) 4. Indicate the number of each material based on the data given in the table. 5. What will happen if we continuously dump trashes on our river? 6. What will you do to avoid pollution in our river?