B. Direction: Match Column A with Column B. Write the letter of the correct answer on the space provided before the number. COLUMN B COLUMN A 6. Main cause of diseases 7. Black Carbon 8. Most polluted river in the world 9. Contaminates 20% of the underground drinking water in China 10. Tiny plants but in large numbers that pump out tons of clean air for us to breathe A. Soot B. Ganges C. Ocean Algae D. Contaminated Water E. Water and Air F. Carcinogens