Lesson: Chapter 15 — The biosphere

15.3. Pollutants and their sources 2 of 5 Reset answers

Clear all your answers?

This erases every answer in this set and starts you again at question one. Your score will be gone.

Type these four numbers to confirm:

Those numbers don't match. Look at them again and type them.

Yes, clear Keep them

Question 2

Which heavy metal is released by burning leaded petrol?

A Mercury B Chromium C Cadmium D Lead

The right answer is the one marked above.

Lead (Pb). Mercury comes from coal and broken instruments; cadmium from plating and pigments.

Answer the question to continue.