GO141 PU Glassy and Vesicular Textures of Igneous Rocks Lab Questions I need the answers to the lab worksheet in my Geology class. I have uploaded a word d
GO141 PU Glassy and Vesicular Textures of Igneous Rocks Lab Questions I need the answers to the lab worksheet in my Geology class. I have uploaded a word document with the questions/pictures on it that need answering. ACTIVITY 5.1 Igneous Rock Inquiry
Name:
Course/Section:
Date:
A. Analyze the igneous rocks below (and actual rock samples of them if available).
They are all x1. Beneath each picture, describe the rocks color, composition (what
it is made of), and texture (the size, shape, and arrangement of its parts). Use your
current knowledge, and complete the worksheet with your current level of ability.
Do not look up terms or other information.
B. REFLECT & DISCUSS
Describe how you would classify the rocks above into groups. Be prepared to
discuss your classification with other geologists.
ACTIVITY 5.4 Glassy and Vesicular Textures of
Igneous Rocks
Name:
Course/Section:
Date:
Place equal parts of sugar (sucrose, C H O ) and water in the pan/beaker and heat on
medium high. Do not touch the hot plate, beaker/pan, or boiling sugar, because it is very
hot! Notice that steam is given off after the sugar dissolves and the solution boils. After a
few minutes there will be no more steam, and the remaining molten sugar will be have a
very thick (viscous) consistency. At this point (before the sugar begins to burn), pour the
thick molten sugar onto a piece of aluminum foil on a flat table. DO NOT TOUCH the molten
sugar, but lift a corner of the foil to observe how it flows and behaves until it hardens (2
3 minutes).
A. Viscosity is a measure of how much a fluid resists flow. Water has low viscosity.
Honey is more viscous than water. How did the viscosity of the sugar solution
change as the water boiled off?
B. What happened to the viscosity of the molten sugar as it cooled on the aluminum
foil?
C. When the molten sugar has cooled to a solid state, break it in half and observe its
texture. Look about the room where you are now seated and name two objects that
have this same texture.
D. Now observe the texture of the cooled solid mass of sugar with a hand lens. Notice
that there are some tiny bubbles of gas within it. Geoscientists call these vesicles,
and rocks containing vesicles are said to have a vesicular texture. What prevented
the gas bubbles from escaping to the atmosphere?
E. REFLECT & DISCUSS
When a sugar solution is permitted to slowly evaporate, sugar crystals form. The
process of crystallization depends on the ability of atoms to move about in the
solution and bond together in an orderly array. What two things may have
prevented crystals from forming in the molten sugar as it cooled on the aluminum
foil in this experiment?
F. In your collection of numbered igneous rock samples, do any of the samples have
the texture that you just observed in Part C? If yes, which one(s)?
G. In your collection of numbered igneous rock samples, do any of the samples have
the texture that you just observed in Part D? If yes, which one(s)?
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