1		2
							3
																			4
						5										6	7
										8					9
						10
		11			12				13
	14
									15
								16
17				18			19		20
											21
				22

Across 1. Throw back from a surface 5. Power needed to grow, move, and live 6. Large mound of sand built up by the wind 10. Color or pattern used by an animal or insect to blend into the backround 13. Threatened with dying out 14. Mate and produce young 15. Supply water to land 16. Underground part of a plant that is short, thick, and round 17. Poison made by some animals 20. Something of a value that can be used 21. Place where a plant or animal lives 22. Increase in Earth's temperature, caused by chemicals in the air that the Sun's heat

Down 2. Series of living things that provide food for each other 3. Substance formed in the ground that is often valuable to people 4. Thin tube that carries blood around the body 7. Unlike anything else 8. Likely to become endangered unless the situation improves 9. Land turning into desert 11. Eat grass and other green plants 12. Change in order to survive in a particular place 18. Digging deep into the ground to search for substances such as salt, gemstones, and oil 19. Take in or soak up