1 Complete the crossword. Across 1 a long line of very big hills 4 a long turning flow of water 5 an area with a lot of trees, plants and animals 8 an area with a lot of sand, but not many plants and almost no water 9 a piece of land with water all around it Down 2 an area between two hills 3 similar to 5 across, but here it rains a lot 6 an area next to the sea with sand, where some people go to spend their holidays 7 a big, cold area that covers the land and sea around the North and South Pole