Rule 2 of magma cooling: Circle the correct choice. Magma loses heat much (faster/slower) when exposed to air or water than it does when surrounded by other rock, because wall rock is a good insulator.
Rule 2 of magma cooling: Circle the correct choice. Magma loses heat much (faster/slower) when exposed to air or water than it does when surrounded by other rock, because wall rock is a good insulator.
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Question
![**EXERCISE 5.3: Interpreting Igneous Cooling Histories from Grain Size (continued)**
**Name:** ___________________________ **Section:** ______________________
**Course:** __________________________ **Date:** _________________________
**Rule 2 of magma cooling:** Circle the correct choice. Magma loses heat much (**faster/slower**) when exposed to air or water than it does when surrounded by other rock, because wall rock is a good insulator.
*(c)* Consider two cubes of steel measuring 1 m on a side. One is cut in half in each dimension to make eight smaller cubes.
![Diagram of a large steel cube, 1m on each side, and its division into 8 smaller cubes, each with 0.5m on each side.]
(i) What is the surface area of the large cube? _________ cm² Of the eight small cubes? _________ cm²
(ii) Imagine the large and small cubes are heated in a furnace to 500°C and removed. Which will cool faster, the large cube or the smaller ones? _______________________________________
(iii) Explain why this happens.
_______________________________________________________
_______________________________________________________
_______________________________________________________
**Rule 3 of magma cooling:** Circle the correct choice. A small mass of magma loses heat (**faster/slower**) than a large one.
*(d)* Now you can put the rules to use.
(i) In general, lava flows and shallow intrusive igneous rocks have (**finer/coarser**) grains than deep intrusive rocks.
(ii) In general, thick lava flows, sills, and dikes have (**finer/coarser**) grains than thin ones.
(iii) Which of the rocks in Figure 5.2 was probably extrusive?
_______________________________________________________
(iv) Which were probably intrusive?
_______________________________________________________](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4bb96ed3-9381-44bd-ada1-564587643b6a%2F6184e89d-0505-4ed9-ad04-469d56957b0d%2F2yxft69_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**EXERCISE 5.3: Interpreting Igneous Cooling Histories from Grain Size (continued)**
**Name:** ___________________________ **Section:** ______________________
**Course:** __________________________ **Date:** _________________________
**Rule 2 of magma cooling:** Circle the correct choice. Magma loses heat much (**faster/slower**) when exposed to air or water than it does when surrounded by other rock, because wall rock is a good insulator.
*(c)* Consider two cubes of steel measuring 1 m on a side. One is cut in half in each dimension to make eight smaller cubes.
![Diagram of a large steel cube, 1m on each side, and its division into 8 smaller cubes, each with 0.5m on each side.]
(i) What is the surface area of the large cube? _________ cm² Of the eight small cubes? _________ cm²
(ii) Imagine the large and small cubes are heated in a furnace to 500°C and removed. Which will cool faster, the large cube or the smaller ones? _______________________________________
(iii) Explain why this happens.
_______________________________________________________
_______________________________________________________
_______________________________________________________
**Rule 3 of magma cooling:** Circle the correct choice. A small mass of magma loses heat (**faster/slower**) than a large one.
*(d)* Now you can put the rules to use.
(i) In general, lava flows and shallow intrusive igneous rocks have (**finer/coarser**) grains than deep intrusive rocks.
(ii) In general, thick lava flows, sills, and dikes have (**finer/coarser**) grains than thin ones.
(iii) Which of the rocks in Figure 5.2 was probably extrusive?
_______________________________________________________
(iv) Which were probably intrusive?
_______________________________________________________
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