1 Daily Warm-Up Exercises 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.

2 Review Day 6 Information

3 Labels Exercise 8.4

4 Naming Labels

5 Naming Labels and Explanatory Labels

6 Captions Exercise 8.5

7 CaSE Book Student Rescource Book, Page 23

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

9 With the caption in place, the viewer has the necessary information. As magma cools, different minerals come together to form crystals, as in this granite. The crystals grow together, filling the spaces.

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

11 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

12 Is there a relationship between crystal size and whether the igneous rock was intrusive or extrusive? 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? Intrusive & Extrusive Rocks

13 Rocks must reach C ( F) 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

14 Turn to a new page in your notebook. Title your page: Salol Observations Observe Salol Melting

15 Each pair needs: lab sheet one bottle of Salol THE BOTTLES MUST STAY CLOSED Each group needs: hot and cold water Materials for Salol Lab

16 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

17 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

18 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

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

20 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? Crystal Size Investigation

21 1.Work as a group. Get two bottles of salol. 2.Place the two bottles of salol in the hot water to melt. 3.Place one bottle on its side in the container of ice water. Place the other bottle on its side in the room temperature water. 4.Observe and record every 30 seconds. 5.Compare the crystals in the two bottles when all the material has crystallized. Procedure