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ERTH101 Lab 5 Part 1 of 2 - Activity 5

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ERTH101 Lab 5 Part 1 of 2 - Activity 5.2 Investigating Mineral Grain Size in Igneous Rock

Question 1 of 6 2 Points

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1. Measure the size of at least 5 crystals in each of the two images and average the values. Report your answers in the statements below in mm. Give your number to the nearest tenths place (for example, 2.4).

             The crystals in the image on the left have an average size of              mm.

             The crystals in the image on the right have an average size of           mm.

 

Question 2 of 6 1 Points

2. Aphanitic texture is associated with rapid cooling

 True

 False

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Question 3 of 6 1 Points

B. Phaneritic texture is associated with slow cooling

 True

 False

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Question 4 of 6 1 Points

2. Fill in the blank with the most appropriate texture term (aphanitic or phaneritic) that correctly completes the following statement

Lavas most commonly have a(n)   texture.

https://laulima.hawaii.edu/portal/site/MAN.85372.202210/tool/2af0c7b5-efba-458e-a629-3574a6f1f5fe/jsf/delivery/beginTakingAssessment  1/3 9/17/21, 8:37 AM                 Laulima : ERTH-101L-007 [MAN.85372.FA21] : Tests & Quizzes

 

Question 5 of 6 2 Points

3. Fill in the blanks below with the term (slowly or rapidly) that correctly completes the following statements

The phenocrysts formed when the magma was cooling   .

The groundmass formed when the magma was cooling   .

 

Question 6 of 6 1 Points

C. Based on everything you've learned in this activity, the porphyritic texture in the rock in

A.

Fast

B.

Slow

C.

Both

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Fig. A5.2.2 likely formed from cooling rates that were:

Part 2 of 2 - Activity 5.3 Glassy and Vesicular Textures of Igneous Rock

Question 1 of 51 Points A. As the water boiled off, the viscosity of the sugar solution decreased True False Reset Selection

Question 2 of 51 Points B. As the molten sugar cooled on the aluminum foil, the viscosity of the sugar increased True False Reset Selection

Question 3 of 51 Points C. The cooled sugar solution is (ideally) glassy in luster and fracture pattern, aphanitic with respect to crystal size, and vesicular. Choose all of the following household materials that have a similar luster or texture.  A. Window glass    B. Ceramic plate    C. Cardboard, cereal box type    D. Steel knife    E. Aluminum baking dish    F. Wooden cutting board    G. Styrofoam cup

Question 4 of 51 Points D. Which of the following options is most likely responsible for vesicles remaining within the cooled sugar?  A.  Gravity  B.  High viscosity  C.  Low viscosity  D.  Flow momentum Reset Selection

Question 5 of 52 Points E. Select the option that correctly fills the blanks in the following statements Crystals may have not formed in this experiment because either: (1) the ____ viscosity of the molten sugar prevented crystallization or (2) the mixture cooled too _____ for crystals to form.  A.  ...low...rapidly  B.  ...low...slowly  C.  ...high...slowly  D.  ...high...rapidly Reset Selection