1Daily 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.

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Review

Day 6 Information

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Labels

Exercise 8.4

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Naming Labels

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Naming Labels and Explanatory Labels

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Captions

Exercise 8.5

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CaSE Book Student Rescource Book, Page 23

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

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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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Salol Crystals (Part 2, steps 1-10)

Investigation 8One Rock to Another

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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

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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

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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

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Turn to a new page in your notebook.

Title your page:

Salol Observations

Observe Salol Melting

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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

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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

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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

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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

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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.

put the bottle in different temperatures of water and find the lowest temperature at which it will melt

Melting Temperature

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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

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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