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31 Multiple choice questions

  1. A vast composite, intrusive, igneous rock body up to several hundred kilometers long and 100 km wide, formed by the intrusion of numerous plutons in the same region.
  2. A rock that solidifies from a melt and consists of interlocking crystals.
  3. A nearly horizontal table-top-shaped tabular intrusion that occurs between the layers of country rock.
  4. Sheets or mounds of lava that flow onto the ground surface or sea floor in molten form and then solidify.
  5. Rock that forms when hot molten rock (magma or lava) cools and freezes solid.
  6. Fragments of igneous material that have been stuck together to form a coherent mass.
  7. Molten rock beneath the EarthÕs surface.
  8. A shallow igneous intrusion that has a blister-like shape.
  9. Igneous rock consisting entirely of glass, or of tiny crystals surrounded by a glass matrix.
  10. The process by which magma becomes progressively more silicic as it cools, because early-formed crystals settle out.
  11. Rock formed by the freezing of magma underground.
  12. A rock composed of angular chunks of volcanic debris that have been cemented together.
  13. A glassy igneous rock that forms from felsic frothy lava and contains abundant (over 50%) pore space.
  14. (1) A vent from which melt from inside the Earth spews out onto the planetÕs surface; (2) a mountain formed by the accumulation of extrusive volcanic rock.
  15. A coarse-grained igneous rock containing crystals of up to tens of centimeters across and occurring in dike-shaped intrusions.
  16. Molten rock that has flowed out onto the EarthÕs surface.
  17. The process of magma contamination in which blocks of wall rock fall into a magma chamber and dissolve.
  18. The sequence in which different silicate minerals crystallize during the progressive cooling of a melt.
  19. Rock made from fragments blown out of a volcano during an explosion that were then packed or welded together.
  20. The melting in a rock of the minerals with the lowest melting temperatures, while other minerals remain solid.
  21. A pyroclastic igneous rock composed of volcanic ash and fragmented pumice, formed when accumulations of the debris cement together.
  22. The change in temperature with depth in the Earth.
  23. Tiny glass shards formed when a fine spray of exploded lava freezes instantly upon contact with the atmosphere.
  24. An irregular or blob-shaped intrusion; can range in size from tens of meters across to tens of kilometers across.
  25. Rock that forms by the freezing of lava above ground, after it flows or explodes out (extrudes) onto the surface and comes into contact with the atmosphere or ocean.
  26. An igneous rock consisting of a solid mass of volcanic glass.
  27. A process by which magma intrudes; blocks of wall rock break off and then sink into the magma.
  28. A glassy mafic igneous rock containing abundant air-filled holes.
  29. A relict of wall rock surrounded by intrusive rock when the intrusive rock freezes.
  30. Open holes in igneous rock formed by the preservation of bubbles in magma as the magma cools into solid rock.
  31. A tabular (wall-shaped) intrusion of rock that cuts across the layering of country rock.