9. What are the environmental
harms caused by mercury
pollution? What are the main
sources of mercury pollution?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Mercury is a metal when present in
the of rivers, lakes and
contaminates fish, crustaceans,
molluscs other living beings. The
accumulates along the food
and in each following level
the amount of metal within the
individuals higher. When humans eat
animals they also become
and severe nervous
system may emerge. The main
of mercury pollution are
mining and the use derived
substances in industry agriculture.