1 * a) Complete the crossword.
L
21
5
T
S
IN
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.​