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Properties of Igneous Rocks Examine the three rock specimens in specimen tray #1. These specimens are examples of three types of igneous rocks: scoria (#60), basalt (#65), and gabbro (#71). In certain ways these three rocks are very similar: they are all dark gray and are composed of essentially identical chemical components. This indicates that the basalt and the gabbro are made of the same minerals. The scoria is fine-grained or glassy and therefore contains no visible minerals. When minerals are present, they are the same ones as found in Tre the basalt and gabbro. In other ways the specimens are different. Using the table below, briefly describe how these three rocks differ from each other. ock Scoria Basalt Gabbro Physical Properties Grain Size (Visible or Microscopic) Air Pockets (Present or Not) How do the differences noted above in grain size and the presence of air pockets arise? (Hint: look at descriptions 8, 10, and 11 in The Geologist as Detective.) Only two of these rock types are found in sills. Which are they and where are they located within the sill? Why?

Properties of Igneous Rocks Examine the three rock specimens in specimen tray #1. These specimens are examples of three types of igneous rocks: scoria (#60), basalt (#65), and gabbro (#71). In certain ways these three rocks are very similar: they are all dark gray and are composed of essentially identical chemical components. This indicates that the basalt and the gabbro are made of the same minerals. The scoria is fine-grained or glassy and therefore contains no visible minerals. When minerals are present, they are the same ones as found in Tre the basalt and gabbro. In other ways the specimens are different. Using the table below, briefly describe how these three rocks differ from each other. ock Scoria Basalt Gabbro Physical Properties Grain Size (Visible or Microscopic) Air Pockets (Present or Not) How do the differences noted above in grain size and the presence of air pockets arise? (Hint: look at descriptions 8, 10, and 11 in The Geologist as Detective.) Only two of these rock types are found in sills. Which are they and where are they located within the sill? Why?

Applications and Investigations in Earth Science (9th Edition)
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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My Properties of Igneous Rocks pershty Examine the three rock specimens in specimen tray #1. These specimens are examples of three types of igneous rocks: scoria (#60), basalt (#65), and gabbro (#71). In certain ways these three rocks are very similar: they are all dark gray and are composed of essentially identical chemical components. This indicates that the basalt and the gabbro are made of the same minerals. The scoria is fine-grained or glassy and therefore contains no visible minerals. When minerals are present, they are the same ones as found in Tined the basalt and gabbro. In other ways the specimens are different. Using the table below, briefly describe how these three rocks differ from each other. Rock Name Scoria Basalt Gabbro Physical Properties Grain Size (Visible or Microscopic) Air Pockets (Present or Not) How do the differences noted above in grain size and the presence of air pockets arise? (Hint: look at descriptions 8, 10, and 11 in The Geologist as Detective.) 94 Only two of these rock types are found in sills. Which are they and where are they located within the sill? Why?
Transcribed Image Text:My Properties of Igneous Rocks pershty Examine the three rock specimens in specimen tray #1. These specimens are examples of three types of igneous rocks: scoria (#60), basalt (#65), and gabbro (#71). In certain ways these three rocks are very similar: they are all dark gray and are composed of essentially identical chemical components. This indicates that the basalt and the gabbro are made of the same minerals. The scoria is fine-grained or glassy and therefore contains no visible minerals. When minerals are present, they are the same ones as found in Tined the basalt and gabbro. In other ways the specimens are different. Using the table below, briefly describe how these three rocks differ from each other. Rock Name Scoria Basalt Gabbro Physical Properties Grain Size (Visible or Microscopic) Air Pockets (Present or Not) How do the differences noted above in grain size and the presence of air pockets arise? (Hint: look at descriptions 8, 10, and 11 in The Geologist as Detective.) 94 Only two of these rock types are found in sills. Which are they and where are they located within the sill? Why?
All three rock types may be found within the lava flow. Where would they be located within the flow? Sue Why? on histo 95
Transcribed Image Text:All three rock types may be found within the lava flow. Where would they be located within the flow? Sue Why? on histo 95
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