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20 True/False questions

  1. ________ mineral grains are of roughly equal size and coarse enough to be seen without a microscope or magnifying glass.phaneritic

          

  2. Which magma is most likely to quench (congeal) to a natural glass?Pegmatite

          

  3. ________ magma cools and consolidates without growth of mineral grains.Pegmatite

          

  4. ________ is composed mainly of ferromagnesian minerals.Pegmatite

          

  5. ________ is named for a prominent, volcanic mountain range in western South America.Basalt

          

  6. Consider the Bowen's reaction series. Which mineral would you expect to see as a phenocryst in a porphyritic basalt?The rock is crystalline; mineral grains are too small to be visible without a magnifying lens or microscope.

          

  7. The sizes, shapes, and arrangements of mineral grains in an igneous rock is known as ________.The extrusive magma cools quickly so the mineral grains do not have time to grow.

          

  8. A ________ is an open cavity in a volcanic rock that was filled by a gas bubble when the lava was still mainly liquid.vesicle

          

  9. A ________ texture would be most unlikely to occur in an extrusive igneous rock.Peridotite

          

  10. ________ is a volcanic rock that is extremely vesicular and glassy.Pumice

          

  11. The last minerals to crystallize on Bowen's Reaction Series result in igneous rocks with a ________ composition.texture

          

  12. ________ is characterized by very coarse mineral grains?Pegmatite

          

  13. ________ is the dominant lava erupted from volcanoes on Hawaii and Iceland.Diorite

          

  14. ________ a magnifying glass or microscope is needed to see individual mineral grains.aphanitic

          

  15. ________ has the same mineral composition as andesite.Diorite

          

  16. Which of the following igneous rocks exhibit aphanitic texture?andesite, rhyolite

          

  17. A (an) ________ texture represents a single, long period of cooling and crystallization.Phaneritic

          

  18. ________ rock has two or more distinctly different-sized populations of mineral grains.glassy

          

  19. Which of the following best describes an aphanitic texture?The rock is crystalline; mineral grains are too small to be visible without a magnifying lens or microscope.

          

  20. Lava flows are typically finer grained than intrusive igneous rocks. Why?The extrusive magma cools quickly so the mineral grains do not have time to grow.