Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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		16								17											18	19
		20													21			22
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 Check 

Across: 1. Surroundings; all of the conditions surrounding and affecting the development of an organism. 3. Water droplets or ice particles condensed from clouds that fall to the earth's surface in the form of rain or snow. 4. An oderless, colorless gass formed by living or decaying plants and animals; the bubbles in soft drinks: _____ dioxide. 6. Trees that are predominantly evergreen and are cone-bearing. 9. Air or atmospheric pressure 12. CO2: Carbon _____. 13. A formation in a cave, for example: boxwork, stalactite or stalagmite. 15. To change or adjust to new surroundings or conditions. 16. A plant or animal that occurs in a region naturally. 17. A meat-eater; an animal that only eats animals. 18. A compound capable of dissolving substances (limestone). 20. A rock formed of sea sediment consistig mainly of the skeletons of marine or aquatic creatures. 23. No longer in existence. 25. A scientist who studies the history of the earth as recorded in rocks and landform. 27. A living community of plants and animals and the physical environment (air, water, sunlight, soil) around them. 28. An animal that eats both plants and animals. 29. A force that exerts or applies pressure. 31. To remain alive or in existence. 32. An animal that seizes and kills another animal for food. 33. The study of the interrelationships between living things and the relationships between organisms and their physical environment.

Down: 1. The loss of water; change of state form liquid water to water vapor. 2. The level or depth in the ground where the rock is completely filled with water and there are no air spaces (two words). 5. A safe place for plants and animals to live. 7. The place where a plant or animal lives. 8. To cause, to come into being; anything brought about by a cause. 10. A structure or behavior that enables a plant or animal to live successfully in its environment. 11. A cave formation which is a fragile, honeycomb-shaped structure of calcite within the walls and ceilings of a cave. 14. A plant-eater; an animal that only eats plants. 19. Calcium carbonate, the predominate mineral in limestone, found in caves in a variety of crystalline forms. 21. To disappear into a liquid; to merge with a liquid. 22. A plant or animal introduced into an area where it does not naturally occur. 24. To protect from harm or danger; a place where animals and plants are kept for protection. 26. A set or arrangement of things so related as to form a whole. 30. Land that has caves, underground rivers and springs. 32. An animal that is seized by a predator.