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19 Matching questions

  1. A (an) ________ texture represents a single, long period of cooling and crystallization.
  2. ________ mineral grains are of roughly equal size and coarse enough to be seen without a microscope or magnifying glass.
  3. The sizes, shapes, and arrangements of mineral grains in an igneous rock is known as ________.
  4. Which of the following best describes an aphanitic texture?
  5. Which magma is most likely to quench (congeal) to a natural glass?
  6. ________ has the same mineral composition as andesite.
  7. ________ rock has two or more distinctly different-sized populations of mineral grains.
  8. The last minerals to crystallize on Bowen's Reaction Series result in igneous rocks with a ________ composition.
  9. Which of the following igneous rocks exhibit aphanitic texture?
  10. ________ a magnifying glass or microscope is needed to see individual mineral grains.
  11. ________ is the dominant lava erupted from volcanoes on Hawaii and Iceland.
  12. ________ is a volcanic rock that is extremely vesicular and glassy.
  13. ________ is composed mainly of ferromagnesian minerals.
  14. Consider the Bowen's reaction series. Which mineral would you expect to see as a phenocryst in a porphyritic basalt?
  15. Lava flows are typically finer grained than intrusive igneous rocks. Why?
  16. ________ is characterized by very coarse mineral grains?
  17. A ________ is an open cavity in a volcanic rock that was filled by a gas bubble when the lava was still mainly liquid.
  18. ________ magma cools and consolidates without growth of mineral grains.
  19. ________ is named for a prominent, volcanic mountain range in western South America.
  1. a The extrusive magma cools quickly so the mineral grains do not have time to grow.
  2. b vesicle
  3. c andesite, rhyolite
  4. d Peridotite
  5. e The rock is crystalline; mineral grains are too small to be visible without a magnifying lens or microscope.
  6. f Andesite
  7. g porphyritic
  8. h phaneritic
  9. i Basalt
  10. j texture
  11. k olivine
  12. l Phaneritic
  13. m felsic
  14. n aphanitic
  15. o Diorite
  16. p Pumice
  17. q glassy
  18. r Pegmatite
  19. s highly viscous; cools quickly