Write the correct word below each definition .
a When most people can't read.
b The opposite of war.
c What you get when chemicals go into rivers.
d When people arrive in another country to live
there.
e People live in this when they are very poor.
f When people treat others badly because of the
colour of their skin.
g A problem affecting children when they don't
have enough to eat.
h When countries fight each other