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Day 7

Day 7. Explain why this is true: When a metamorphic rock is forming, it may be subjected to extremely high temperatures, yet it never completely melts. (Hint: What would the rock be if it completely melted?).

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Day 7

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  1. Day 7 Explain why this is true: When a metamorphic rock is forming, it may be subjected to extremely high temperatures, yet it never completely melts. (Hint: What would the rock be if it completely melted?) Because if it melts, it would become molten rock. If it then cools and hardens, it would be an igneous rock. Daily Warm-Up Exercises

  2. Salol Crystals (Part 1, steps 1-10) Investigation 8 One Rock to Another

  3. Examine your igneous rocks with a hand lens. Look for crystals (pieces of pure minerals) in the rocks. Sort into intrusive and extrusive. Intrusive & Extrusive Rocks

  4. Is there a relationship between crystal size and whether the igneous rock was intrusive or extrusive? Intrusive & Extrusive Rocks • Intrusive rocks like granite have larger crystals. • Obsidian doesn’t appear to have any crystals. Why do some igneous rocks have larger crystals than others?

  5. Rocks must reach 750 0C (1382 0F) or more before they will begin to melt. We can’t melt rocks in class, but we will use Salol to simulate the melting and cooling of a rock. Salol melts at the temperature of hot tap water. Salol

  6. Forming crystals is called crystallization. Crystal shape is one of the properties geologists use to help them identify minerals. Salol crystals form the same shapes each time they crystallize (needles; feathers; diamonds; broken ice). Crystallization

  7. Turn to a new page in your notebook. Title your page and create table. Salol Observations Observe Salol Melting

  8. Crystal Size Investigation Use lab pages 77-79. Design an experiment using salol to answer the following questions: • What variable do you think will affect the size of the crystals that form? • What effect will this variable have on crystal size?

  9. What are some of the variables that might affect the size of the crystals that form? Variables • Temperature • Rate of cooling • Length of time in hot water • The way the bottle lies as it cools

  10. Each group needs: Lab sheet Hand lenses Ruler 2 bottles of Salol 2-3 ½ Liter containers Hot & cold water (ice) Goggles THE BOTTLES MUST STAY CLOSED! Materials for Salol Lab

  11. Procedure • Work as a group. Get two bottles of salol. • Place the two bottles of salol in the hot water to melt. • Place one bottle on its side in the container of ice water. Place the other bottle on its side in the room temperature water. • Observe and record every 30 seconds. • Compare the crystals in the two bottles when all the material has crystallized.

  12. Data Table 12

  13. Observations – Draw what you see Include measurements w/ units! 13

  14. What happened when you placed the salol in the cold water? it hardened and turned back into crystals What do the crystals look like? some look like crushed ice or big sugar crystals; others look like flat needles or feathery branches; some grow in rosettes from a central point or circle Discuss What Happened

  15. Stop Here

  16. How can we find out the temperature at which salol melts? Salol melts at around 40 0C. If the temperature drops below 40 0C, the salol will begin to crystallize. Melting Temperature put the bottle in different temperatures of water and find the lowest temperature at which it will melt

  17. What did the salol look like before you placed it in hot water? white crystals on the side of the bottle How long did it take for the salol to melt? about 1 minute Discuss What Happened

  18. Review Day 6 Information

  19. Labels Exercise 8.4

  20. Naming Labels

  21. Naming Labels and Explanatory Labels

  22. Captions Exercise 8.5

  23. CaSE Book Student Rescource Book, Page 23

  24. Without a caption, it is difficult to know much about this image:

  25. With the caption in place, the viewer has the necessary information. As magma cools, different minerals come together toform crystals, as in this granite. The crystals growtogether, filling the spaces.

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