Sections 2.8, 2.11 & 2.12

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Across
  1. 2. Canada is the world’s top exporter of minerals such as iron, nickel, copper, _____________ and zinc.
  2. 5. Plants absorb phosphorus in the form of compounds called ______________.
  3. 7. Minerals are mixed with many compounds in rocks called __________. Ex: calcium – limestone (CaCO_3).
  4. 9. The first step in the Metallurgy Process is crushing the rocks and separating the mineral from waste materials such as ________.
  5. 13. ____________ production is one of the most important natural resource industries in Canada.
  6. 17. Centuries later – mixing copper and tin to make a metal alloy called ___________.
  7. 18. ______________ can form compounds with nitrate or phosphate called potassium nitrate (KNO_3) or potassium phosphate (K_3PO_4).
  8. 19. Oxygen (O_2) makes up about 21% of the air you breathe and is called oxygen gas. All ___________ need oxygen to survive.
  9. 21. _______________ is the technology of separating a metal from its ore (rock).
  10. 22. _____________ is a chemical process in which plants combine carbon dioxide from the air/water and energy from the Sun to produce sugars and oxygen gas.
  11. 24. Air is mostly __________ and oxygen.
  12. 26. Carbon _________ (CO_2) is necessary for life on Earth. Carbon dioxide is released in the air by humans and by emissions from cars, factories etc.
Down
  1. 1. ______________ are naturally occurring compounds that contain a metal combined with oxygen, sulfur or other elements.
  2. 3. Producing the metal from the mineral in the metallurgy process involves ___________ changes.
  3. 4. Plants that grow in soil have been carefully enriched by the addition of chemical substances. These substances added to the soil to help plants to grow are called ____________.
  4. 6. __________ use Carbon dioxide to make Oxygen.
  5. 8. Ozone at ground level is harmful to living things. It can damage plants and cause ____________ problems to humans.
  6. 10. ____________ is harmless and is used for filling electric light bulbs and fluorescent tubes.
  7. 11. Nitrogen gas mixed with ________ produces Nitrogen Dioxide (NO_2) which is a toxic gas and it causes a yellow haze in the air.
  8. 12. The Ozone layer is very important to life on Earth because it ________ most of the Ultraviolet rays (UV rays) from the Sun.
  9. 13. Carbon ____________ (CO) is extremely poisonous. When Carbon monoxide molecules enter the lungs, the body’s red blood cells treat CO like oxygen.
  10. 14. Nitrogen (N) makes up approximately 80% of the _____________ and we can breathe it safely.
  11. 15. ____________ come from minerals in the soil and some from decomposing plant and animal matter.
  12. 16. Using a chemical reaction called nitrogen _____________, a few plants are able to change nitrogen from the air into compounds called nitrates.
  13. 20. ____________ are metals melted and mixed with other metals.
  14. 23. Solder is an alloy of _________ and tin. Solder is melted to join metal pieces such as electronic components, pipes or wires.
  15. 25. Prehistoric – used stone and ________ tools to plants crops, hunt animals and chop wood.