Biomes, houses and materials

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Across
  1. 3. frozen water.
  2. 4. house made of blocks of snow.
  3. 7. a thick forest of tall trees which is found in tropical areas where there is a lot of rain.
  4. 8. a small house made of wood, mud, grass, or stones.
  5. 9. land covered with wild grass.
Down
  1. 1. rectangular blocks of baked clay used for building walls, which are usually red or brown.
  2. 2. a large area of land, usually in a hot region, where there is almost no water, rain, trees, or plants.
  3. 5. areas of land in the north of Europe, Asia, and America. The top layer of soil is always frozen and no trees grow there.
  4. 6. the material which forms the trunks and branches of trees.