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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Across: 2. Waste that cannot be destroyed . 3. Ability of an ecosystem to continuously support the life forms in it. 4. Waste that will break down in the environment. 6. Protection, preservation and management of wildlife and natural resources. 7. Use a single item more than once. 8. Everything that affects an organism during its lifetime. 9. Science that deals with life-sustaining systems on earth. 10. Extract and reconstitute raw materials in discarded items.

Down: 1. Material containing a substance that may endanger the life or health of a living organism when released into the environment. 5. Variety of all life forms, their genes and the ecosystems they make up.