A) complete the crossword.
1
across
1 low land between hills.
2 there are five of these between the
usa and canada.
5 europe is one of these.
6 there are a lot of trees in it.
7 the world's highest is everest.
down
1 vesuvius is a famous one.
3 the most famous one is the sahara.
4 water that flows over the edge of
a mountain or a cliff.​