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9. The texture of an igneous rock relates to the size of the minerals within the rock. The table below summarizes some of the key textures that you will find in igneous rocks. So far, we have seen rocks with aphanitic, phaneritic and glassy textures. Igneous rocks can also be pyroclastic or have a vesicular texture. Rocks with a vesicular texture have holes in them that were once gas bubbles in lava. The term pyroclastic refers to material that has been ejected from a volcano during an explosive eruption. The texture of the rock gives clues to the location of formation of the rock. Extrusive rocks form above the surface and Intrusive rocks form below the surface. The last column has been left mostly blank. Fill in the remaining cells. Description Texture Location of Formation (Extrusive or Intrusive) Very small minerals (can't be seen with the naked eye) Aphanitic Contains larger minerals of a similar Phaneritic size (can be seen with the naked eye) Mixed size (small and large) Porphyritic Below, and later at Earth's surface (intrusive and later extrusive) No individually visible crystals Glassy Very small and contains gas bubbles Vesicular Contains ash fragments rather than Pyroclastic minerals

9. The texture of an igneous rock relates to the size of the minerals within the rock. The table below summarizes some of the key textures that you will find in igneous rocks. So far, we have seen rocks with aphanitic, phaneritic and glassy textures. Igneous rocks can also be pyroclastic or have a vesicular texture. Rocks with a vesicular texture have holes in them that were once gas bubbles in lava. The term pyroclastic refers to material that has been ejected from a volcano during an explosive eruption. The texture of the rock gives clues to the location of formation of the rock. Extrusive rocks form above the surface and Intrusive rocks form below the surface. The last column has been left mostly blank. Fill in the remaining cells. Description Texture Location of Formation (Extrusive or Intrusive) Very small minerals (can't be seen with the naked eye) Aphanitic Contains larger minerals of a similar Phaneritic size (can be seen with the naked eye) Mixed size (small and large) Porphyritic Below, and later at Earth's surface (intrusive and later extrusive) No individually visible crystals Glassy Very small and contains gas bubbles Vesicular Contains ash fragments rather than Pyroclastic minerals

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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7. Which rocks formed under slow cooling Vs. conditions? Check all that apply. Vs. 8. Where do you think molten rocks cool faster? Explain why you chose this answer. 9. The texture of an igneous rock relates to the size of the minerals within the rock. The table below summarizes some of the key textures that you will find in igneous rocks. So far, we have seen rocks with aphanitic, phaneritic and glassy textures. Igneous rocks can also be pyroclastic or have a vesicular texture. Rocks with a vesicular texture have holes in them that were once gas bubbles in lava. The term pyroclastic refers to material that has been ejected from a volcano during an explosive eruption. The texture of the rock gives clues to the location of formation of the rock. Extrusive rocks form above the surface and Intrusive rocks form below the surface. The last column has been left mostly blank. Fill in the remaining cells. Description Texture Location of Formation (Extrusive or Intrusive) Very small minerals (can't be seen with the naked eye) Aphanitic Contains larger minerals of a similar size (can be seen with the naked eye) Mixed size (small and large) Phaneritic Porphyritic Below, and later at Earth's surface (intrusive and later extrusive) No individually visible crystals Glassy Very small and contains gas bubbles Vesicular Contains ash fragments rather than minerals Pyroclastic
Transcribed Image Text:7. Which rocks formed under slow cooling Vs. conditions? Check all that apply. Vs. 8. Where do you think molten rocks cool faster? Explain why you chose this answer. 9. The texture of an igneous rock relates to the size of the minerals within the rock. The table below summarizes some of the key textures that you will find in igneous rocks. So far, we have seen rocks with aphanitic, phaneritic and glassy textures. Igneous rocks can also be pyroclastic or have a vesicular texture. Rocks with a vesicular texture have holes in them that were once gas bubbles in lava. The term pyroclastic refers to material that has been ejected from a volcano during an explosive eruption. The texture of the rock gives clues to the location of formation of the rock. Extrusive rocks form above the surface and Intrusive rocks form below the surface. The last column has been left mostly blank. Fill in the remaining cells. Description Texture Location of Formation (Extrusive or Intrusive) Very small minerals (can't be seen with the naked eye) Aphanitic Contains larger minerals of a similar size (can be seen with the naked eye) Mixed size (small and large) Phaneritic Porphyritic Below, and later at Earth's surface (intrusive and later extrusive) No individually visible crystals Glassy Very small and contains gas bubbles Vesicular Contains ash fragments rather than minerals Pyroclastic
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