Crossword Puzzle Unit 3. The world around us.Online version Vocabulary. by Sonia Jiménez Ridruejo 1 Group of islands. 2 A house near the sea to help boats when it is foggy. 3 Small river. 4 The grass is 5 Houses are 6 Group of trees. 7 Mineral used to make statues. 8 Space between mountains. 9 To cross a river you need a 10 A group of mountains is a mountain 11 Where the river begins. 12 When the river reaches the sea is the 4 12 9 11 1 2 8 7 10 6 3 5