Across
- 4. occurs in areas with drier climates
- 6. dissolves nutrients in the soil
- 7. a high humus level helps produce ____ in the soil
- 8. large area of Precambrian rock that forms the core of a continent
- 14. prairie higher precipitation levels caused grasses to grow longer than in other places
- 15. trees also known as broadleaf trees
- 17. prairie little precipitation causes grasses to be shorter than in other areas
- 20. ______ must have moisture and heat for their survival
- 23. most of the tundra has this
- 24. between grasslands and boreal forest is the third grassland sub-region, called ________
- 25. come from parent material
- 27. vegetation plants that grow without any human interference.
- 29. seeds long-grass prairie is ideal for growing grains and _________________
- 30. solid rock beneath the soil
Down
- 1. located above the tree line
- 2. trees known as needle-leaved trees
- 3. able to live with limited amounts of rainfall
- 5. action water from below drawn up to replace the water in the topsoil
- 9. well-balanced mixture of sand, silt, clay, and humus
- 10. what plants and animals are decomposed by
- 11. zones areas of change
- 12. forest contains both coniferous and deciduous trees
- 13. provides nutrients and moisture for plants
- 16. and taiga forest largest vegetation region in Canada
- 18. forest area of mature forest that has never been cut down
- 19. natural feature on Earth's surface
- 21. layer top meter or so of permafrost that thaws during the summer
- 22. top layer of soil containing humus
- 26. consists of minerals, bacteria and organic materials; air; and moisture
- 28. forest lush forest in an area with very heavy precipitation